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// File generated from our OpenAPI spec
package com.stripe.param;

import com.google.gson.annotations.SerializedName;
import com.stripe.net.ApiRequestParams;
import com.stripe.param.common.EmptyParam;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import lombok.Getter;

@Getter
public class InvoiceCreatePreviewParams extends ApiRequestParams {
  /** Settings for automatic tax lookup for this invoice preview. */
  @SerializedName("automatic_tax")
  AutomaticTax automaticTax;

  /**
   * The ID of the coupon to apply to this phase of the subscription schedule. This field has been
   * deprecated and will be removed in a future API version. Use {@code discounts} instead.
   */
  @SerializedName("coupon")
  String coupon;

  /**
   * The currency to preview this invoice in. Defaults to that of {@code customer} if not specified.
   */
  @SerializedName("currency")
  String currency;

  /**
   * The identifier of the customer whose upcoming invoice you'd like to retrieve. If {@code
   * automatic_tax} is enabled then one of {@code customer}, {@code customer_details}, {@code
   * subscription}, or {@code schedule} must be set.
   */
  @SerializedName("customer")
  String customer;

  /**
   * Details about the customer you want to invoice or overrides for an existing customer. If {@code
   * automatic_tax} is enabled then one of {@code customer}, {@code customer_details}, {@code
   * subscription}, or {@code schedule} must be set.
   */
  @SerializedName("customer_details")
  CustomerDetails customerDetails;

  /**
   * The coupons to redeem into discounts for the invoice preview. If not specified, inherits the
   * discount from the subscription or customer. This works for both coupons directly applied to an
   * invoice and coupons applied to a subscription. Pass an empty string to avoid inheriting any
   * discounts.
   */
  @SerializedName("discounts")
  Object discounts;

  /** Specifies which fields in the response should be expanded. */
  @SerializedName("expand")
  List expand;

  /**
   * Map of extra parameters for custom features not available in this client library. The content
   * in this map is not serialized under this field's {@code @SerializedName} value. Instead, each
   * key/value pair is serialized as if the key is a root-level field (serialized) name in this
   * param object. Effectively, this map is flattened to its parent instance.
   */
  @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
  Map extraParams;

  /** List of invoice items to add or update in the upcoming invoice preview. */
  @SerializedName("invoice_items")
  List invoiceItems;

  /**
   * The connected account that issues the invoice. The invoice is presented with the branding and
   * support information of the specified account.
   */
  @SerializedName("issuer")
  Issuer issuer;

  /**
   * The account (if any) for which the funds of the invoice payment are intended. If set, the
   * invoice will be presented with the branding and support information of the specified account.
   * See the Invoices with Connect
   * documentation for details.
   */
  @SerializedName("on_behalf_of")
  Object onBehalfOf;

  /**
   * Customizes the types of values to include when calculating the invoice. Defaults to {@code
   * next} if unspecified.
   */
  @SerializedName("preview_mode")
  PreviewMode previewMode;

  /**
   * The identifier of the schedule whose upcoming invoice you'd like to retrieve. Cannot be used
   * with subscription or subscription fields.
   */
  @SerializedName("schedule")
  String schedule;

  /**
   * The schedule creation or modification params to apply as a preview. Cannot be used with {@code
   * subscription} or {@code subscription_} prefixed fields.
   */
  @SerializedName("schedule_details")
  ScheduleDetails scheduleDetails;

  /**
   * The identifier of the subscription for which you'd like to retrieve the upcoming invoice. If
   * not provided, but a {@code subscription_details.items} is provided, you will preview creating a
   * subscription with those items. If neither {@code subscription} nor {@code
   * subscription_details.items} is provided, you will retrieve the next upcoming invoice from among
   * the customer's subscriptions.
   */
  @SerializedName("subscription")
  String subscription;

  /**
   * The subscription creation or modification params to apply as a preview. Cannot be used with
   * {@code schedule} or {@code schedule_details} fields.
   */
  @SerializedName("subscription_details")
  SubscriptionDetails subscriptionDetails;

  private InvoiceCreatePreviewParams(
      AutomaticTax automaticTax,
      String coupon,
      String currency,
      String customer,
      CustomerDetails customerDetails,
      Object discounts,
      List expand,
      Map extraParams,
      List invoiceItems,
      Issuer issuer,
      Object onBehalfOf,
      PreviewMode previewMode,
      String schedule,
      ScheduleDetails scheduleDetails,
      String subscription,
      SubscriptionDetails subscriptionDetails) {
    this.automaticTax = automaticTax;
    this.coupon = coupon;
    this.currency = currency;
    this.customer = customer;
    this.customerDetails = customerDetails;
    this.discounts = discounts;
    this.expand = expand;
    this.extraParams = extraParams;
    this.invoiceItems = invoiceItems;
    this.issuer = issuer;
    this.onBehalfOf = onBehalfOf;
    this.previewMode = previewMode;
    this.schedule = schedule;
    this.scheduleDetails = scheduleDetails;
    this.subscription = subscription;
    this.subscriptionDetails = subscriptionDetails;
  }

  public static Builder builder() {
    return new Builder();
  }

  public static class Builder {
    private AutomaticTax automaticTax;

    private String coupon;

    private String currency;

    private String customer;

    private CustomerDetails customerDetails;

    private Object discounts;

    private List expand;

    private Map extraParams;

    private List invoiceItems;

    private Issuer issuer;

    private Object onBehalfOf;

    private PreviewMode previewMode;

    private String schedule;

    private ScheduleDetails scheduleDetails;

    private String subscription;

    private SubscriptionDetails subscriptionDetails;

    /** Finalize and obtain parameter instance from this builder. */
    public InvoiceCreatePreviewParams build() {
      return new InvoiceCreatePreviewParams(
          this.automaticTax,
          this.coupon,
          this.currency,
          this.customer,
          this.customerDetails,
          this.discounts,
          this.expand,
          this.extraParams,
          this.invoiceItems,
          this.issuer,
          this.onBehalfOf,
          this.previewMode,
          this.schedule,
          this.scheduleDetails,
          this.subscription,
          this.subscriptionDetails);
    }

    /** Settings for automatic tax lookup for this invoice preview. */
    public Builder setAutomaticTax(InvoiceCreatePreviewParams.AutomaticTax automaticTax) {
      this.automaticTax = automaticTax;
      return this;
    }

    /**
     * The ID of the coupon to apply to this phase of the subscription schedule. This field has been
     * deprecated and will be removed in a future API version. Use {@code discounts} instead.
     */
    public Builder setCoupon(String coupon) {
      this.coupon = coupon;
      return this;
    }

    /**
     * The currency to preview this invoice in. Defaults to that of {@code customer} if not
     * specified.
     */
    public Builder setCurrency(String currency) {
      this.currency = currency;
      return this;
    }

    /**
     * The identifier of the customer whose upcoming invoice you'd like to retrieve. If {@code
     * automatic_tax} is enabled then one of {@code customer}, {@code customer_details}, {@code
     * subscription}, or {@code schedule} must be set.
     */
    public Builder setCustomer(String customer) {
      this.customer = customer;
      return this;
    }

    /**
     * Details about the customer you want to invoice or overrides for an existing customer. If
     * {@code automatic_tax} is enabled then one of {@code customer}, {@code customer_details},
     * {@code subscription}, or {@code schedule} must be set.
     */
    public Builder setCustomerDetails(InvoiceCreatePreviewParams.CustomerDetails customerDetails) {
      this.customerDetails = customerDetails;
      return this;
    }

    /**
     * Add an element to `discounts` list. A list is initialized for the first `add/addAll` call,
     * and subsequent calls adds additional elements to the original list. See {@link
     * InvoiceCreatePreviewParams#discounts} for the field documentation.
     */
    @SuppressWarnings("unchecked")
    public Builder addDiscount(InvoiceCreatePreviewParams.Discount element) {
      if (this.discounts == null || this.discounts instanceof EmptyParam) {
        this.discounts = new ArrayList();
      }
      ((List) this.discounts).add(element);
      return this;
    }

    /**
     * Add all elements to `discounts` list. A list is initialized for the first `add/addAll` call,
     * and subsequent calls adds additional elements to the original list. See {@link
     * InvoiceCreatePreviewParams#discounts} for the field documentation.
     */
    @SuppressWarnings("unchecked")
    public Builder addAllDiscount(List elements) {
      if (this.discounts == null || this.discounts instanceof EmptyParam) {
        this.discounts = new ArrayList();
      }
      ((List) this.discounts).addAll(elements);
      return this;
    }

    /**
     * The coupons to redeem into discounts for the invoice preview. If not specified, inherits the
     * discount from the subscription or customer. This works for both coupons directly applied to
     * an invoice and coupons applied to a subscription. Pass an empty string to avoid inheriting
     * any discounts.
     */
    public Builder setDiscounts(EmptyParam discounts) {
      this.discounts = discounts;
      return this;
    }

    /**
     * The coupons to redeem into discounts for the invoice preview. If not specified, inherits the
     * discount from the subscription or customer. This works for both coupons directly applied to
     * an invoice and coupons applied to a subscription. Pass an empty string to avoid inheriting
     * any discounts.
     */
    public Builder setDiscounts(List discounts) {
      this.discounts = discounts;
      return this;
    }

    /**
     * Add an element to `expand` list. A list is initialized for the first `add/addAll` call, and
     * subsequent calls adds additional elements to the original list. See {@link
     * InvoiceCreatePreviewParams#expand} for the field documentation.
     */
    public Builder addExpand(String element) {
      if (this.expand == null) {
        this.expand = new ArrayList<>();
      }
      this.expand.add(element);
      return this;
    }

    /**
     * Add all elements to `expand` list. A list is initialized for the first `add/addAll` call, and
     * subsequent calls adds additional elements to the original list. See {@link
     * InvoiceCreatePreviewParams#expand} for the field documentation.
     */
    public Builder addAllExpand(List elements) {
      if (this.expand == null) {
        this.expand = new ArrayList<>();
      }
      this.expand.addAll(elements);
      return this;
    }

    /**
     * Add a key/value pair to `extraParams` map. A map is initialized for the first `put/putAll`
     * call, and subsequent calls add additional key/value pairs to the original map. See {@link
     * InvoiceCreatePreviewParams#extraParams} for the field documentation.
     */
    public Builder putExtraParam(String key, Object value) {
      if (this.extraParams == null) {
        this.extraParams = new HashMap<>();
      }
      this.extraParams.put(key, value);
      return this;
    }

    /**
     * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
     * `put/putAll` call, and subsequent calls add additional key/value pairs to the original map.
     * See {@link InvoiceCreatePreviewParams#extraParams} for the field documentation.
     */
    public Builder putAllExtraParam(Map map) {
      if (this.extraParams == null) {
        this.extraParams = new HashMap<>();
      }
      this.extraParams.putAll(map);
      return this;
    }

    /**
     * Add an element to `invoiceItems` list. A list is initialized for the first `add/addAll` call,
     * and subsequent calls adds additional elements to the original list. See {@link
     * InvoiceCreatePreviewParams#invoiceItems} for the field documentation.
     */
    public Builder addInvoiceItem(InvoiceCreatePreviewParams.InvoiceItem element) {
      if (this.invoiceItems == null) {
        this.invoiceItems = new ArrayList<>();
      }
      this.invoiceItems.add(element);
      return this;
    }

    /**
     * Add all elements to `invoiceItems` list. A list is initialized for the first `add/addAll`
     * call, and subsequent calls adds additional elements to the original list. See {@link
     * InvoiceCreatePreviewParams#invoiceItems} for the field documentation.
     */
    public Builder addAllInvoiceItem(List elements) {
      if (this.invoiceItems == null) {
        this.invoiceItems = new ArrayList<>();
      }
      this.invoiceItems.addAll(elements);
      return this;
    }

    /**
     * The connected account that issues the invoice. The invoice is presented with the branding and
     * support information of the specified account.
     */
    public Builder setIssuer(InvoiceCreatePreviewParams.Issuer issuer) {
      this.issuer = issuer;
      return this;
    }

    /**
     * The account (if any) for which the funds of the invoice payment are intended. If set, the
     * invoice will be presented with the branding and support information of the specified account.
     * See the Invoices with Connect
     * documentation for details.
     */
    public Builder setOnBehalfOf(String onBehalfOf) {
      this.onBehalfOf = onBehalfOf;
      return this;
    }

    /**
     * The account (if any) for which the funds of the invoice payment are intended. If set, the
     * invoice will be presented with the branding and support information of the specified account.
     * See the Invoices with Connect
     * documentation for details.
     */
    public Builder setOnBehalfOf(EmptyParam onBehalfOf) {
      this.onBehalfOf = onBehalfOf;
      return this;
    }

    /**
     * Customizes the types of values to include when calculating the invoice. Defaults to {@code
     * next} if unspecified.
     */
    public Builder setPreviewMode(InvoiceCreatePreviewParams.PreviewMode previewMode) {
      this.previewMode = previewMode;
      return this;
    }

    /**
     * The identifier of the schedule whose upcoming invoice you'd like to retrieve. Cannot be used
     * with subscription or subscription fields.
     */
    public Builder setSchedule(String schedule) {
      this.schedule = schedule;
      return this;
    }

    /**
     * The schedule creation or modification params to apply as a preview. Cannot be used with
     * {@code subscription} or {@code subscription_} prefixed fields.
     */
    public Builder setScheduleDetails(InvoiceCreatePreviewParams.ScheduleDetails scheduleDetails) {
      this.scheduleDetails = scheduleDetails;
      return this;
    }

    /**
     * The identifier of the subscription for which you'd like to retrieve the upcoming invoice. If
     * not provided, but a {@code subscription_details.items} is provided, you will preview creating
     * a subscription with those items. If neither {@code subscription} nor {@code
     * subscription_details.items} is provided, you will retrieve the next upcoming invoice from
     * among the customer's subscriptions.
     */
    public Builder setSubscription(String subscription) {
      this.subscription = subscription;
      return this;
    }

    /**
     * The subscription creation or modification params to apply as a preview. Cannot be used with
     * {@code schedule} or {@code schedule_details} fields.
     */
    public Builder setSubscriptionDetails(
        InvoiceCreatePreviewParams.SubscriptionDetails subscriptionDetails) {
      this.subscriptionDetails = subscriptionDetails;
      return this;
    }
  }

  @Getter
  public static class AutomaticTax {
    /**
     * Required. Whether Stripe automatically computes tax on this invoice. Note
     * that incompatible invoice items (invoice items with manually specified tax rates, negative amounts, or {@code
     * tax_behavior=unspecified}) cannot be added to automatic tax invoices.
     */
    @SerializedName("enabled")
    Boolean enabled;

    /**
     * Map of extra parameters for custom features not available in this client library. The content
     * in this map is not serialized under this field's {@code @SerializedName} value. Instead, each
     * key/value pair is serialized as if the key is a root-level field (serialized) name in this
     * param object. Effectively, this map is flattened to its parent instance.
     */
    @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
    Map extraParams;

    /**
     * The account that's liable for tax. If set, the business address and tax registrations
     * required to perform the tax calculation are loaded from this account. The tax transaction is
     * returned in the report of the connected account.
     */
    @SerializedName("liability")
    Liability liability;

    private AutomaticTax(Boolean enabled, Map extraParams, Liability liability) {
      this.enabled = enabled;
      this.extraParams = extraParams;
      this.liability = liability;
    }

    public static Builder builder() {
      return new Builder();
    }

    public static class Builder {
      private Boolean enabled;

      private Map extraParams;

      private Liability liability;

      /** Finalize and obtain parameter instance from this builder. */
      public InvoiceCreatePreviewParams.AutomaticTax build() {
        return new InvoiceCreatePreviewParams.AutomaticTax(
            this.enabled, this.extraParams, this.liability);
      }

      /**
       * Required. Whether Stripe automatically computes tax on this invoice. Note
       * that incompatible invoice items (invoice items with manually specified tax rates, negative amounts, or {@code
       * tax_behavior=unspecified}) cannot be added to automatic tax invoices.
       */
      public Builder setEnabled(Boolean enabled) {
        this.enabled = enabled;
        return this;
      }

      /**
       * Add a key/value pair to `extraParams` map. A map is initialized for the first `put/putAll`
       * call, and subsequent calls add additional key/value pairs to the original map. See {@link
       * InvoiceCreatePreviewParams.AutomaticTax#extraParams} for the field documentation.
       */
      public Builder putExtraParam(String key, Object value) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.put(key, value);
        return this;
      }

      /**
       * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
       * `put/putAll` call, and subsequent calls add additional key/value pairs to the original map.
       * See {@link InvoiceCreatePreviewParams.AutomaticTax#extraParams} for the field
       * documentation.
       */
      public Builder putAllExtraParam(Map map) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.putAll(map);
        return this;
      }

      /**
       * The account that's liable for tax. If set, the business address and tax registrations
       * required to perform the tax calculation are loaded from this account. The tax transaction
       * is returned in the report of the connected account.
       */
      public Builder setLiability(InvoiceCreatePreviewParams.AutomaticTax.Liability liability) {
        this.liability = liability;
        return this;
      }
    }

    @Getter
    public static class Liability {
      /** The connected account being referenced when {@code type} is {@code account}. */
      @SerializedName("account")
      String account;

      /**
       * Map of extra parameters for custom features not available in this client library. The
       * content in this map is not serialized under this field's {@code @SerializedName} value.
       * Instead, each key/value pair is serialized as if the key is a root-level field (serialized)
       * name in this param object. Effectively, this map is flattened to its parent instance.
       */
      @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
      Map extraParams;

      /** Required. Type of the account referenced in the request. */
      @SerializedName("type")
      Type type;

      private Liability(String account, Map extraParams, Type type) {
        this.account = account;
        this.extraParams = extraParams;
        this.type = type;
      }

      public static Builder builder() {
        return new Builder();
      }

      public static class Builder {
        private String account;

        private Map extraParams;

        private Type type;

        /** Finalize and obtain parameter instance from this builder. */
        public InvoiceCreatePreviewParams.AutomaticTax.Liability build() {
          return new InvoiceCreatePreviewParams.AutomaticTax.Liability(
              this.account, this.extraParams, this.type);
        }

        /** The connected account being referenced when {@code type} is {@code account}. */
        public Builder setAccount(String account) {
          this.account = account;
          return this;
        }

        /**
         * Add a key/value pair to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.AutomaticTax.Liability#extraParams} for the
         * field documentation.
         */
        public Builder putExtraParam(String key, Object value) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.put(key, value);
          return this;
        }

        /**
         * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.AutomaticTax.Liability#extraParams} for the
         * field documentation.
         */
        public Builder putAllExtraParam(Map map) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.putAll(map);
          return this;
        }

        /** Required. Type of the account referenced in the request. */
        public Builder setType(InvoiceCreatePreviewParams.AutomaticTax.Liability.Type type) {
          this.type = type;
          return this;
        }
      }

      public enum Type implements ApiRequestParams.EnumParam {
        @SerializedName("account")
        ACCOUNT("account"),

        @SerializedName("self")
        SELF("self");

        @Getter(onMethod_ = {@Override})
        private final String value;

        Type(String value) {
          this.value = value;
        }
      }
    }
  }

  @Getter
  public static class CustomerDetails {
    /** The customer's address. */
    @SerializedName("address")
    Object address;

    /**
     * Map of extra parameters for custom features not available in this client library. The content
     * in this map is not serialized under this field's {@code @SerializedName} value. Instead, each
     * key/value pair is serialized as if the key is a root-level field (serialized) name in this
     * param object. Effectively, this map is flattened to its parent instance.
     */
    @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
    Map extraParams;

    /** The customer's shipping information. Appears on invoices emailed to this customer. */
    @SerializedName("shipping")
    Object shipping;

    /** Tax details about the customer. */
    @SerializedName("tax")
    Tax tax;

    /** The customer's tax exemption. One of {@code none}, {@code exempt}, or {@code reverse}. */
    @SerializedName("tax_exempt")
    ApiRequestParams.EnumParam taxExempt;

    /** The customer's tax IDs. */
    @SerializedName("tax_ids")
    List taxIds;

    private CustomerDetails(
        Object address,
        Map extraParams,
        Object shipping,
        Tax tax,
        ApiRequestParams.EnumParam taxExempt,
        List taxIds) {
      this.address = address;
      this.extraParams = extraParams;
      this.shipping = shipping;
      this.tax = tax;
      this.taxExempt = taxExempt;
      this.taxIds = taxIds;
    }

    public static Builder builder() {
      return new Builder();
    }

    public static class Builder {
      private Object address;

      private Map extraParams;

      private Object shipping;

      private Tax tax;

      private ApiRequestParams.EnumParam taxExempt;

      private List taxIds;

      /** Finalize and obtain parameter instance from this builder. */
      public InvoiceCreatePreviewParams.CustomerDetails build() {
        return new InvoiceCreatePreviewParams.CustomerDetails(
            this.address, this.extraParams, this.shipping, this.tax, this.taxExempt, this.taxIds);
      }

      /** The customer's address. */
      public Builder setAddress(InvoiceCreatePreviewParams.CustomerDetails.Address address) {
        this.address = address;
        return this;
      }

      /** The customer's address. */
      public Builder setAddress(EmptyParam address) {
        this.address = address;
        return this;
      }

      /**
       * Add a key/value pair to `extraParams` map. A map is initialized for the first `put/putAll`
       * call, and subsequent calls add additional key/value pairs to the original map. See {@link
       * InvoiceCreatePreviewParams.CustomerDetails#extraParams} for the field documentation.
       */
      public Builder putExtraParam(String key, Object value) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.put(key, value);
        return this;
      }

      /**
       * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
       * `put/putAll` call, and subsequent calls add additional key/value pairs to the original map.
       * See {@link InvoiceCreatePreviewParams.CustomerDetails#extraParams} for the field
       * documentation.
       */
      public Builder putAllExtraParam(Map map) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.putAll(map);
        return this;
      }

      /** The customer's shipping information. Appears on invoices emailed to this customer. */
      public Builder setShipping(InvoiceCreatePreviewParams.CustomerDetails.Shipping shipping) {
        this.shipping = shipping;
        return this;
      }

      /** The customer's shipping information. Appears on invoices emailed to this customer. */
      public Builder setShipping(EmptyParam shipping) {
        this.shipping = shipping;
        return this;
      }

      /** Tax details about the customer. */
      public Builder setTax(InvoiceCreatePreviewParams.CustomerDetails.Tax tax) {
        this.tax = tax;
        return this;
      }

      /** The customer's tax exemption. One of {@code none}, {@code exempt}, or {@code reverse}. */
      public Builder setTaxExempt(InvoiceCreatePreviewParams.CustomerDetails.TaxExempt taxExempt) {
        this.taxExempt = taxExempt;
        return this;
      }

      /** The customer's tax exemption. One of {@code none}, {@code exempt}, or {@code reverse}. */
      public Builder setTaxExempt(EmptyParam taxExempt) {
        this.taxExempt = taxExempt;
        return this;
      }

      /**
       * Add an element to `taxIds` list. A list is initialized for the first `add/addAll` call, and
       * subsequent calls adds additional elements to the original list. See {@link
       * InvoiceCreatePreviewParams.CustomerDetails#taxIds} for the field documentation.
       */
      public Builder addTaxId(InvoiceCreatePreviewParams.CustomerDetails.TaxId element) {
        if (this.taxIds == null) {
          this.taxIds = new ArrayList<>();
        }
        this.taxIds.add(element);
        return this;
      }

      /**
       * Add all elements to `taxIds` list. A list is initialized for the first `add/addAll` call,
       * and subsequent calls adds additional elements to the original list. See {@link
       * InvoiceCreatePreviewParams.CustomerDetails#taxIds} for the field documentation.
       */
      public Builder addAllTaxId(List elements) {
        if (this.taxIds == null) {
          this.taxIds = new ArrayList<>();
        }
        this.taxIds.addAll(elements);
        return this;
      }
    }

    @Getter
    public static class Address {
      /** City, district, suburb, town, or village. */
      @SerializedName("city")
      String city;

      /**
       * Two-letter country code (ISO
       * 3166-1 alpha-2).
       */
      @SerializedName("country")
      String country;

      /**
       * Map of extra parameters for custom features not available in this client library. The
       * content in this map is not serialized under this field's {@code @SerializedName} value.
       * Instead, each key/value pair is serialized as if the key is a root-level field (serialized)
       * name in this param object. Effectively, this map is flattened to its parent instance.
       */
      @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
      Map extraParams;

      /** Address line 1 (e.g., street, PO Box, or company name). */
      @SerializedName("line1")
      String line1;

      /** Address line 2 (e.g., apartment, suite, unit, or building). */
      @SerializedName("line2")
      String line2;

      /** ZIP or postal code. */
      @SerializedName("postal_code")
      String postalCode;

      /** State, county, province, or region. */
      @SerializedName("state")
      String state;

      private Address(
          String city,
          String country,
          Map extraParams,
          String line1,
          String line2,
          String postalCode,
          String state) {
        this.city = city;
        this.country = country;
        this.extraParams = extraParams;
        this.line1 = line1;
        this.line2 = line2;
        this.postalCode = postalCode;
        this.state = state;
      }

      public static Builder builder() {
        return new Builder();
      }

      public static class Builder {
        private String city;

        private String country;

        private Map extraParams;

        private String line1;

        private String line2;

        private String postalCode;

        private String state;

        /** Finalize and obtain parameter instance from this builder. */
        public InvoiceCreatePreviewParams.CustomerDetails.Address build() {
          return new InvoiceCreatePreviewParams.CustomerDetails.Address(
              this.city,
              this.country,
              this.extraParams,
              this.line1,
              this.line2,
              this.postalCode,
              this.state);
        }

        /** City, district, suburb, town, or village. */
        public Builder setCity(String city) {
          this.city = city;
          return this;
        }

        /**
         * Two-letter country code (ISO
         * 3166-1 alpha-2).
         */
        public Builder setCountry(String country) {
          this.country = country;
          return this;
        }

        /**
         * Add a key/value pair to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.CustomerDetails.Address#extraParams} for the
         * field documentation.
         */
        public Builder putExtraParam(String key, Object value) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.put(key, value);
          return this;
        }

        /**
         * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.CustomerDetails.Address#extraParams} for the
         * field documentation.
         */
        public Builder putAllExtraParam(Map map) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.putAll(map);
          return this;
        }

        /** Address line 1 (e.g., street, PO Box, or company name). */
        public Builder setLine1(String line1) {
          this.line1 = line1;
          return this;
        }

        /** Address line 2 (e.g., apartment, suite, unit, or building). */
        public Builder setLine2(String line2) {
          this.line2 = line2;
          return this;
        }

        /** ZIP or postal code. */
        public Builder setPostalCode(String postalCode) {
          this.postalCode = postalCode;
          return this;
        }

        /** State, county, province, or region. */
        public Builder setState(String state) {
          this.state = state;
          return this;
        }
      }
    }

    @Getter
    public static class Shipping {
      /** Required. Customer shipping address. */
      @SerializedName("address")
      Address address;

      /**
       * Map of extra parameters for custom features not available in this client library. The
       * content in this map is not serialized under this field's {@code @SerializedName} value.
       * Instead, each key/value pair is serialized as if the key is a root-level field (serialized)
       * name in this param object. Effectively, this map is flattened to its parent instance.
       */
      @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
      Map extraParams;

      /** Required. Customer name. */
      @SerializedName("name")
      String name;

      /** Customer phone (including extension). */
      @SerializedName("phone")
      String phone;

      private Shipping(
          Address address, Map extraParams, String name, String phone) {
        this.address = address;
        this.extraParams = extraParams;
        this.name = name;
        this.phone = phone;
      }

      public static Builder builder() {
        return new Builder();
      }

      public static class Builder {
        private Address address;

        private Map extraParams;

        private String name;

        private String phone;

        /** Finalize and obtain parameter instance from this builder. */
        public InvoiceCreatePreviewParams.CustomerDetails.Shipping build() {
          return new InvoiceCreatePreviewParams.CustomerDetails.Shipping(
              this.address, this.extraParams, this.name, this.phone);
        }

        /** Required. Customer shipping address. */
        public Builder setAddress(
            InvoiceCreatePreviewParams.CustomerDetails.Shipping.Address address) {
          this.address = address;
          return this;
        }

        /**
         * Add a key/value pair to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.CustomerDetails.Shipping#extraParams} for the
         * field documentation.
         */
        public Builder putExtraParam(String key, Object value) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.put(key, value);
          return this;
        }

        /**
         * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.CustomerDetails.Shipping#extraParams} for the
         * field documentation.
         */
        public Builder putAllExtraParam(Map map) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.putAll(map);
          return this;
        }

        /** Required. Customer name. */
        public Builder setName(String name) {
          this.name = name;
          return this;
        }

        /** Customer phone (including extension). */
        public Builder setPhone(String phone) {
          this.phone = phone;
          return this;
        }
      }

      @Getter
      public static class Address {
        /** City, district, suburb, town, or village. */
        @SerializedName("city")
        String city;

        /**
         * Two-letter country code (ISO
         * 3166-1 alpha-2).
         */
        @SerializedName("country")
        String country;

        /**
         * Map of extra parameters for custom features not available in this client library. The
         * content in this map is not serialized under this field's {@code @SerializedName} value.
         * Instead, each key/value pair is serialized as if the key is a root-level field
         * (serialized) name in this param object. Effectively, this map is flattened to its parent
         * instance.
         */
        @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
        Map extraParams;

        /** Address line 1 (e.g., street, PO Box, or company name). */
        @SerializedName("line1")
        String line1;

        /** Address line 2 (e.g., apartment, suite, unit, or building). */
        @SerializedName("line2")
        String line2;

        /** ZIP or postal code. */
        @SerializedName("postal_code")
        String postalCode;

        /** State, county, province, or region. */
        @SerializedName("state")
        String state;

        private Address(
            String city,
            String country,
            Map extraParams,
            String line1,
            String line2,
            String postalCode,
            String state) {
          this.city = city;
          this.country = country;
          this.extraParams = extraParams;
          this.line1 = line1;
          this.line2 = line2;
          this.postalCode = postalCode;
          this.state = state;
        }

        public static Builder builder() {
          return new Builder();
        }

        public static class Builder {
          private String city;

          private String country;

          private Map extraParams;

          private String line1;

          private String line2;

          private String postalCode;

          private String state;

          /** Finalize and obtain parameter instance from this builder. */
          public InvoiceCreatePreviewParams.CustomerDetails.Shipping.Address build() {
            return new InvoiceCreatePreviewParams.CustomerDetails.Shipping.Address(
                this.city,
                this.country,
                this.extraParams,
                this.line1,
                this.line2,
                this.postalCode,
                this.state);
          }

          /** City, district, suburb, town, or village. */
          public Builder setCity(String city) {
            this.city = city;
            return this;
          }

          /**
           * Two-letter country code (ISO
           * 3166-1 alpha-2).
           */
          public Builder setCountry(String country) {
            this.country = country;
            return this;
          }

          /**
           * Add a key/value pair to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.CustomerDetails.Shipping.Address#extraParams} for the field
           * documentation.
           */
          public Builder putExtraParam(String key, Object value) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.put(key, value);
            return this;
          }

          /**
           * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.CustomerDetails.Shipping.Address#extraParams} for the field
           * documentation.
           */
          public Builder putAllExtraParam(Map map) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.putAll(map);
            return this;
          }

          /** Address line 1 (e.g., street, PO Box, or company name). */
          public Builder setLine1(String line1) {
            this.line1 = line1;
            return this;
          }

          /** Address line 2 (e.g., apartment, suite, unit, or building). */
          public Builder setLine2(String line2) {
            this.line2 = line2;
            return this;
          }

          /** ZIP or postal code. */
          public Builder setPostalCode(String postalCode) {
            this.postalCode = postalCode;
            return this;
          }

          /** State, county, province, or region. */
          public Builder setState(String state) {
            this.state = state;
            return this;
          }
        }
      }
    }

    @Getter
    public static class Tax {
      /**
       * Map of extra parameters for custom features not available in this client library. The
       * content in this map is not serialized under this field's {@code @SerializedName} value.
       * Instead, each key/value pair is serialized as if the key is a root-level field (serialized)
       * name in this param object. Effectively, this map is flattened to its parent instance.
       */
      @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
      Map extraParams;

      /**
       * A recent IP address of the customer used for tax reporting and tax location inference.
       * Stripe recommends updating the IP address when a new PaymentMethod is attached or the
       * address field on the customer is updated. We recommend against updating this field more
       * frequently since it could result in unexpected tax location/reporting outcomes.
       */
      @SerializedName("ip_address")
      Object ipAddress;

      private Tax(Map extraParams, Object ipAddress) {
        this.extraParams = extraParams;
        this.ipAddress = ipAddress;
      }

      public static Builder builder() {
        return new Builder();
      }

      public static class Builder {
        private Map extraParams;

        private Object ipAddress;

        /** Finalize and obtain parameter instance from this builder. */
        public InvoiceCreatePreviewParams.CustomerDetails.Tax build() {
          return new InvoiceCreatePreviewParams.CustomerDetails.Tax(
              this.extraParams, this.ipAddress);
        }

        /**
         * Add a key/value pair to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.CustomerDetails.Tax#extraParams} for the field
         * documentation.
         */
        public Builder putExtraParam(String key, Object value) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.put(key, value);
          return this;
        }

        /**
         * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.CustomerDetails.Tax#extraParams} for the field
         * documentation.
         */
        public Builder putAllExtraParam(Map map) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.putAll(map);
          return this;
        }

        /**
         * A recent IP address of the customer used for tax reporting and tax location inference.
         * Stripe recommends updating the IP address when a new PaymentMethod is attached or the
         * address field on the customer is updated. We recommend against updating this field more
         * frequently since it could result in unexpected tax location/reporting outcomes.
         */
        public Builder setIpAddress(String ipAddress) {
          this.ipAddress = ipAddress;
          return this;
        }

        /**
         * A recent IP address of the customer used for tax reporting and tax location inference.
         * Stripe recommends updating the IP address when a new PaymentMethod is attached or the
         * address field on the customer is updated. We recommend against updating this field more
         * frequently since it could result in unexpected tax location/reporting outcomes.
         */
        public Builder setIpAddress(EmptyParam ipAddress) {
          this.ipAddress = ipAddress;
          return this;
        }
      }
    }

    @Getter
    public static class TaxId {
      /**
       * Map of extra parameters for custom features not available in this client library. The
       * content in this map is not serialized under this field's {@code @SerializedName} value.
       * Instead, each key/value pair is serialized as if the key is a root-level field (serialized)
       * name in this param object. Effectively, this map is flattened to its parent instance.
       */
      @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
      Map extraParams;

      /**
       * Required. Type of the tax ID, one of {@code ad_nrt}, {@code ae_trn},
       * {@code ar_cuit}, {@code au_abn}, {@code au_arn}, {@code bg_uic}, {@code bh_vat}, {@code
       * bo_tin}, {@code br_cnpj}, {@code br_cpf}, {@code ca_bn}, {@code ca_gst_hst}, {@code
       * ca_pst_bc}, {@code ca_pst_mb}, {@code ca_pst_sk}, {@code ca_qst}, {@code ch_uid}, {@code
       * ch_vat}, {@code cl_tin}, {@code cn_tin}, {@code co_nit}, {@code cr_tin}, {@code de_stn},
       * {@code do_rcn}, {@code ec_ruc}, {@code eg_tin}, {@code es_cif}, {@code eu_oss_vat}, {@code
       * eu_vat}, {@code gb_vat}, {@code ge_vat}, {@code hk_br}, {@code hu_tin}, {@code id_npwp},
       * {@code il_vat}, {@code in_gst}, {@code is_vat}, {@code jp_cn}, {@code jp_rn}, {@code
       * jp_trn}, {@code ke_pin}, {@code kr_brn}, {@code kz_bin}, {@code li_uid}, {@code mx_rfc},
       * {@code my_frp}, {@code my_itn}, {@code my_sst}, {@code ng_tin}, {@code no_vat}, {@code
       * no_voec}, {@code nz_gst}, {@code om_vat}, {@code pe_ruc}, {@code ph_tin}, {@code ro_tin},
       * {@code rs_pib}, {@code ru_inn}, {@code ru_kpp}, {@code sa_vat}, {@code sg_gst}, {@code
       * sg_uen}, {@code si_tin}, {@code sv_nit}, {@code th_vat}, {@code tr_tin}, {@code tw_vat},
       * {@code ua_vat}, {@code us_ein}, {@code uy_ruc}, {@code ve_rif}, {@code vn_tin}, or {@code
       * za_vat}
       */
      @SerializedName("type")
      Type type;

      /** Required. Value of the tax ID. */
      @SerializedName("value")
      String value;

      private TaxId(Map extraParams, Type type, String value) {
        this.extraParams = extraParams;
        this.type = type;
        this.value = value;
      }

      public static Builder builder() {
        return new Builder();
      }

      public static class Builder {
        private Map extraParams;

        private Type type;

        private String value;

        /** Finalize and obtain parameter instance from this builder. */
        public InvoiceCreatePreviewParams.CustomerDetails.TaxId build() {
          return new InvoiceCreatePreviewParams.CustomerDetails.TaxId(
              this.extraParams, this.type, this.value);
        }

        /**
         * Add a key/value pair to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.CustomerDetails.TaxId#extraParams} for the
         * field documentation.
         */
        public Builder putExtraParam(String key, Object value) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.put(key, value);
          return this;
        }

        /**
         * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.CustomerDetails.TaxId#extraParams} for the
         * field documentation.
         */
        public Builder putAllExtraParam(Map map) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.putAll(map);
          return this;
        }

        /**
         * Required. Type of the tax ID, one of {@code ad_nrt}, {@code ae_trn},
         * {@code ar_cuit}, {@code au_abn}, {@code au_arn}, {@code bg_uic}, {@code bh_vat}, {@code
         * bo_tin}, {@code br_cnpj}, {@code br_cpf}, {@code ca_bn}, {@code ca_gst_hst}, {@code
         * ca_pst_bc}, {@code ca_pst_mb}, {@code ca_pst_sk}, {@code ca_qst}, {@code ch_uid}, {@code
         * ch_vat}, {@code cl_tin}, {@code cn_tin}, {@code co_nit}, {@code cr_tin}, {@code de_stn},
         * {@code do_rcn}, {@code ec_ruc}, {@code eg_tin}, {@code es_cif}, {@code eu_oss_vat},
         * {@code eu_vat}, {@code gb_vat}, {@code ge_vat}, {@code hk_br}, {@code hu_tin}, {@code
         * id_npwp}, {@code il_vat}, {@code in_gst}, {@code is_vat}, {@code jp_cn}, {@code jp_rn},
         * {@code jp_trn}, {@code ke_pin}, {@code kr_brn}, {@code kz_bin}, {@code li_uid}, {@code
         * mx_rfc}, {@code my_frp}, {@code my_itn}, {@code my_sst}, {@code ng_tin}, {@code no_vat},
         * {@code no_voec}, {@code nz_gst}, {@code om_vat}, {@code pe_ruc}, {@code ph_tin}, {@code
         * ro_tin}, {@code rs_pib}, {@code ru_inn}, {@code ru_kpp}, {@code sa_vat}, {@code sg_gst},
         * {@code sg_uen}, {@code si_tin}, {@code sv_nit}, {@code th_vat}, {@code tr_tin}, {@code
         * tw_vat}, {@code ua_vat}, {@code us_ein}, {@code uy_ruc}, {@code ve_rif}, {@code vn_tin},
         * or {@code za_vat}
         */
        public Builder setType(InvoiceCreatePreviewParams.CustomerDetails.TaxId.Type type) {
          this.type = type;
          return this;
        }

        /** Required. Value of the tax ID. */
        public Builder setValue(String value) {
          this.value = value;
          return this;
        }
      }

      public enum Type implements ApiRequestParams.EnumParam {
        @SerializedName("ad_nrt")
        AD_NRT("ad_nrt"),

        @SerializedName("ae_trn")
        AE_TRN("ae_trn"),

        @SerializedName("ar_cuit")
        AR_CUIT("ar_cuit"),

        @SerializedName("au_abn")
        AU_ABN("au_abn"),

        @SerializedName("au_arn")
        AU_ARN("au_arn"),

        @SerializedName("bg_uic")
        BG_UIC("bg_uic"),

        @SerializedName("bh_vat")
        BH_VAT("bh_vat"),

        @SerializedName("bo_tin")
        BO_TIN("bo_tin"),

        @SerializedName("br_cnpj")
        BR_CNPJ("br_cnpj"),

        @SerializedName("br_cpf")
        BR_CPF("br_cpf"),

        @SerializedName("ca_bn")
        CA_BN("ca_bn"),

        @SerializedName("ca_gst_hst")
        CA_GST_HST("ca_gst_hst"),

        @SerializedName("ca_pst_bc")
        CA_PST_BC("ca_pst_bc"),

        @SerializedName("ca_pst_mb")
        CA_PST_MB("ca_pst_mb"),

        @SerializedName("ca_pst_sk")
        CA_PST_SK("ca_pst_sk"),

        @SerializedName("ca_qst")
        CA_QST("ca_qst"),

        @SerializedName("ch_uid")
        CH_UID("ch_uid"),

        @SerializedName("ch_vat")
        CH_VAT("ch_vat"),

        @SerializedName("cl_tin")
        CL_TIN("cl_tin"),

        @SerializedName("cn_tin")
        CN_TIN("cn_tin"),

        @SerializedName("co_nit")
        CO_NIT("co_nit"),

        @SerializedName("cr_tin")
        CR_TIN("cr_tin"),

        @SerializedName("de_stn")
        DE_STN("de_stn"),

        @SerializedName("do_rcn")
        DO_RCN("do_rcn"),

        @SerializedName("ec_ruc")
        EC_RUC("ec_ruc"),

        @SerializedName("eg_tin")
        EG_TIN("eg_tin"),

        @SerializedName("es_cif")
        ES_CIF("es_cif"),

        @SerializedName("eu_oss_vat")
        EU_OSS_VAT("eu_oss_vat"),

        @SerializedName("eu_vat")
        EU_VAT("eu_vat"),

        @SerializedName("gb_vat")
        GB_VAT("gb_vat"),

        @SerializedName("ge_vat")
        GE_VAT("ge_vat"),

        @SerializedName("hk_br")
        HK_BR("hk_br"),

        @SerializedName("hu_tin")
        HU_TIN("hu_tin"),

        @SerializedName("id_npwp")
        ID_NPWP("id_npwp"),

        @SerializedName("il_vat")
        IL_VAT("il_vat"),

        @SerializedName("in_gst")
        IN_GST("in_gst"),

        @SerializedName("is_vat")
        IS_VAT("is_vat"),

        @SerializedName("jp_cn")
        JP_CN("jp_cn"),

        @SerializedName("jp_rn")
        JP_RN("jp_rn"),

        @SerializedName("jp_trn")
        JP_TRN("jp_trn"),

        @SerializedName("ke_pin")
        KE_PIN("ke_pin"),

        @SerializedName("kr_brn")
        KR_BRN("kr_brn"),

        @SerializedName("kz_bin")
        KZ_BIN("kz_bin"),

        @SerializedName("li_uid")
        LI_UID("li_uid"),

        @SerializedName("mx_rfc")
        MX_RFC("mx_rfc"),

        @SerializedName("my_frp")
        MY_FRP("my_frp"),

        @SerializedName("my_itn")
        MY_ITN("my_itn"),

        @SerializedName("my_sst")
        MY_SST("my_sst"),

        @SerializedName("ng_tin")
        NG_TIN("ng_tin"),

        @SerializedName("no_vat")
        NO_VAT("no_vat"),

        @SerializedName("no_voec")
        NO_VOEC("no_voec"),

        @SerializedName("nz_gst")
        NZ_GST("nz_gst"),

        @SerializedName("om_vat")
        OM_VAT("om_vat"),

        @SerializedName("pe_ruc")
        PE_RUC("pe_ruc"),

        @SerializedName("ph_tin")
        PH_TIN("ph_tin"),

        @SerializedName("ro_tin")
        RO_TIN("ro_tin"),

        @SerializedName("rs_pib")
        RS_PIB("rs_pib"),

        @SerializedName("ru_inn")
        RU_INN("ru_inn"),

        @SerializedName("ru_kpp")
        RU_KPP("ru_kpp"),

        @SerializedName("sa_vat")
        SA_VAT("sa_vat"),

        @SerializedName("sg_gst")
        SG_GST("sg_gst"),

        @SerializedName("sg_uen")
        SG_UEN("sg_uen"),

        @SerializedName("si_tin")
        SI_TIN("si_tin"),

        @SerializedName("sv_nit")
        SV_NIT("sv_nit"),

        @SerializedName("th_vat")
        TH_VAT("th_vat"),

        @SerializedName("tr_tin")
        TR_TIN("tr_tin"),

        @SerializedName("tw_vat")
        TW_VAT("tw_vat"),

        @SerializedName("ua_vat")
        UA_VAT("ua_vat"),

        @SerializedName("us_ein")
        US_EIN("us_ein"),

        @SerializedName("uy_ruc")
        UY_RUC("uy_ruc"),

        @SerializedName("ve_rif")
        VE_RIF("ve_rif"),

        @SerializedName("vn_tin")
        VN_TIN("vn_tin"),

        @SerializedName("za_vat")
        ZA_VAT("za_vat");

        @Getter(onMethod_ = {@Override})
        private final String value;

        Type(String value) {
          this.value = value;
        }
      }
    }

    public enum TaxExempt implements ApiRequestParams.EnumParam {
      @SerializedName("exempt")
      EXEMPT("exempt"),

      @SerializedName("none")
      NONE("none"),

      @SerializedName("reverse")
      REVERSE("reverse");

      @Getter(onMethod_ = {@Override})
      private final String value;

      TaxExempt(String value) {
        this.value = value;
      }
    }
  }

  @Getter
  public static class Discount {
    /** ID of the coupon to create a new discount for. */
    @SerializedName("coupon")
    String coupon;

    /** ID of an existing discount on the object (or one of its ancestors) to reuse. */
    @SerializedName("discount")
    String discount;

    /**
     * Map of extra parameters for custom features not available in this client library. The content
     * in this map is not serialized under this field's {@code @SerializedName} value. Instead, each
     * key/value pair is serialized as if the key is a root-level field (serialized) name in this
     * param object. Effectively, this map is flattened to its parent instance.
     */
    @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
    Map extraParams;

    /** ID of the promotion code to create a new discount for. */
    @SerializedName("promotion_code")
    String promotionCode;

    private Discount(
        String coupon, String discount, Map extraParams, String promotionCode) {
      this.coupon = coupon;
      this.discount = discount;
      this.extraParams = extraParams;
      this.promotionCode = promotionCode;
    }

    public static Builder builder() {
      return new Builder();
    }

    public static class Builder {
      private String coupon;

      private String discount;

      private Map extraParams;

      private String promotionCode;

      /** Finalize and obtain parameter instance from this builder. */
      public InvoiceCreatePreviewParams.Discount build() {
        return new InvoiceCreatePreviewParams.Discount(
            this.coupon, this.discount, this.extraParams, this.promotionCode);
      }

      /** ID of the coupon to create a new discount for. */
      public Builder setCoupon(String coupon) {
        this.coupon = coupon;
        return this;
      }

      /** ID of an existing discount on the object (or one of its ancestors) to reuse. */
      public Builder setDiscount(String discount) {
        this.discount = discount;
        return this;
      }

      /**
       * Add a key/value pair to `extraParams` map. A map is initialized for the first `put/putAll`
       * call, and subsequent calls add additional key/value pairs to the original map. See {@link
       * InvoiceCreatePreviewParams.Discount#extraParams} for the field documentation.
       */
      public Builder putExtraParam(String key, Object value) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.put(key, value);
        return this;
      }

      /**
       * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
       * `put/putAll` call, and subsequent calls add additional key/value pairs to the original map.
       * See {@link InvoiceCreatePreviewParams.Discount#extraParams} for the field documentation.
       */
      public Builder putAllExtraParam(Map map) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.putAll(map);
        return this;
      }

      /** ID of the promotion code to create a new discount for. */
      public Builder setPromotionCode(String promotionCode) {
        this.promotionCode = promotionCode;
        return this;
      }
    }
  }

  @Getter
  public static class InvoiceItem {
    /** The integer amount in cents (or local equivalent) of previewed invoice item. */
    @SerializedName("amount")
    Long amount;

    /**
     * Three-letter ISO currency
     * code, in lowercase. Must be a supported
     * currency. Only applicable to new invoice items.
     */
    @SerializedName("currency")
    String currency;

    /**
     * An arbitrary string which you can attach to the invoice item. The description is displayed in
     * the invoice for easy tracking.
     */
    @SerializedName("description")
    String description;

    /**
     * Explicitly controls whether discounts apply to this invoice item. Defaults to true, except
     * for negative invoice items.
     */
    @SerializedName("discountable")
    Boolean discountable;

    /** The coupons to redeem into discounts for the invoice item in the preview. */
    @SerializedName("discounts")
    Object discounts;

    /**
     * Map of extra parameters for custom features not available in this client library. The content
     * in this map is not serialized under this field's {@code @SerializedName} value. Instead, each
     * key/value pair is serialized as if the key is a root-level field (serialized) name in this
     * param object. Effectively, this map is flattened to its parent instance.
     */
    @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
    Map extraParams;

    /**
     * The ID of the invoice item to update in preview. If not specified, a new invoice item will be
     * added to the preview of the upcoming invoice.
     */
    @SerializedName("invoiceitem")
    String invoiceitem;

    /**
     * Set of key-value pairs that you can attach
     * to an object. This can be useful for storing additional information about the object in a
     * structured format. Individual keys can be unset by posting an empty value to them. All keys
     * can be unset by posting an empty value to {@code metadata}.
     */
    @SerializedName("metadata")
    Object metadata;

    /**
     * The period associated with this invoice item. When set to different values, the period will
     * be rendered on the invoice. If you have Stripe Revenue Recognition enabled,
     * the period will be used to recognize and defer revenue. See the Revenue
     * Recognition documentation for details.
     */
    @SerializedName("period")
    Period period;

    /** The ID of the price object. One of {@code price} or {@code price_data} is required. */
    @SerializedName("price")
    String price;

    /**
     * Data used to generate a new Price object
     * inline. One of {@code price} or {@code price_data} is required.
     */
    @SerializedName("price_data")
    PriceData priceData;

    /** Non-negative integer. The quantity of units for the invoice item. */
    @SerializedName("quantity")
    Long quantity;

    /**
     * Only required if a default
     * tax behavior was not provided in the Stripe Tax settings. Specifies whether the price is
     * considered inclusive of taxes or exclusive of taxes. One of {@code inclusive}, {@code
     * exclusive}, or {@code unspecified}. Once specified as either {@code inclusive} or {@code
     * exclusive}, it cannot be changed.
     */
    @SerializedName("tax_behavior")
    TaxBehavior taxBehavior;

    /** A tax code ID. */
    @SerializedName("tax_code")
    Object taxCode;

    /**
     * The tax rates that apply to the item. When set, any {@code default_tax_rates} do not apply to
     * this item.
     */
    @SerializedName("tax_rates")
    Object taxRates;

    /**
     * The integer unit amount in cents (or local equivalent) of the charge to be applied to the
     * upcoming invoice. This unit_amount will be multiplied by the quantity to get the full amount.
     * If you want to apply a credit to the customer's account, pass a negative unit_amount.
     */
    @SerializedName("unit_amount")
    Long unitAmount;

    /**
     * Same as {@code unit_amount}, but accepts a decimal value in cents (or local equivalent) with
     * at most 12 decimal places. Only one of {@code unit_amount} and {@code unit_amount_decimal}
     * can be set.
     */
    @SerializedName("unit_amount_decimal")
    BigDecimal unitAmountDecimal;

    private InvoiceItem(
        Long amount,
        String currency,
        String description,
        Boolean discountable,
        Object discounts,
        Map extraParams,
        String invoiceitem,
        Object metadata,
        Period period,
        String price,
        PriceData priceData,
        Long quantity,
        TaxBehavior taxBehavior,
        Object taxCode,
        Object taxRates,
        Long unitAmount,
        BigDecimal unitAmountDecimal) {
      this.amount = amount;
      this.currency = currency;
      this.description = description;
      this.discountable = discountable;
      this.discounts = discounts;
      this.extraParams = extraParams;
      this.invoiceitem = invoiceitem;
      this.metadata = metadata;
      this.period = period;
      this.price = price;
      this.priceData = priceData;
      this.quantity = quantity;
      this.taxBehavior = taxBehavior;
      this.taxCode = taxCode;
      this.taxRates = taxRates;
      this.unitAmount = unitAmount;
      this.unitAmountDecimal = unitAmountDecimal;
    }

    public static Builder builder() {
      return new Builder();
    }

    public static class Builder {
      private Long amount;

      private String currency;

      private String description;

      private Boolean discountable;

      private Object discounts;

      private Map extraParams;

      private String invoiceitem;

      private Object metadata;

      private Period period;

      private String price;

      private PriceData priceData;

      private Long quantity;

      private TaxBehavior taxBehavior;

      private Object taxCode;

      private Object taxRates;

      private Long unitAmount;

      private BigDecimal unitAmountDecimal;

      /** Finalize and obtain parameter instance from this builder. */
      public InvoiceCreatePreviewParams.InvoiceItem build() {
        return new InvoiceCreatePreviewParams.InvoiceItem(
            this.amount,
            this.currency,
            this.description,
            this.discountable,
            this.discounts,
            this.extraParams,
            this.invoiceitem,
            this.metadata,
            this.period,
            this.price,
            this.priceData,
            this.quantity,
            this.taxBehavior,
            this.taxCode,
            this.taxRates,
            this.unitAmount,
            this.unitAmountDecimal);
      }

      /** The integer amount in cents (or local equivalent) of previewed invoice item. */
      public Builder setAmount(Long amount) {
        this.amount = amount;
        return this;
      }

      /**
       * Three-letter ISO currency
       * code, in lowercase. Must be a supported
       * currency. Only applicable to new invoice items.
       */
      public Builder setCurrency(String currency) {
        this.currency = currency;
        return this;
      }

      /**
       * An arbitrary string which you can attach to the invoice item. The description is displayed
       * in the invoice for easy tracking.
       */
      public Builder setDescription(String description) {
        this.description = description;
        return this;
      }

      /**
       * Explicitly controls whether discounts apply to this invoice item. Defaults to true, except
       * for negative invoice items.
       */
      public Builder setDiscountable(Boolean discountable) {
        this.discountable = discountable;
        return this;
      }

      /**
       * Add an element to `discounts` list. A list is initialized for the first `add/addAll` call,
       * and subsequent calls adds additional elements to the original list. See {@link
       * InvoiceCreatePreviewParams.InvoiceItem#discounts} for the field documentation.
       */
      @SuppressWarnings("unchecked")
      public Builder addDiscount(InvoiceCreatePreviewParams.InvoiceItem.Discount element) {
        if (this.discounts == null || this.discounts instanceof EmptyParam) {
          this.discounts = new ArrayList();
        }
        ((List) this.discounts).add(element);
        return this;
      }

      /**
       * Add all elements to `discounts` list. A list is initialized for the first `add/addAll`
       * call, and subsequent calls adds additional elements to the original list. See {@link
       * InvoiceCreatePreviewParams.InvoiceItem#discounts} for the field documentation.
       */
      @SuppressWarnings("unchecked")
      public Builder addAllDiscount(
          List elements) {
        if (this.discounts == null || this.discounts instanceof EmptyParam) {
          this.discounts = new ArrayList();
        }
        ((List) this.discounts).addAll(elements);
        return this;
      }

      /** The coupons to redeem into discounts for the invoice item in the preview. */
      public Builder setDiscounts(EmptyParam discounts) {
        this.discounts = discounts;
        return this;
      }

      /** The coupons to redeem into discounts for the invoice item in the preview. */
      public Builder setDiscounts(List discounts) {
        this.discounts = discounts;
        return this;
      }

      /**
       * Add a key/value pair to `extraParams` map. A map is initialized for the first `put/putAll`
       * call, and subsequent calls add additional key/value pairs to the original map. See {@link
       * InvoiceCreatePreviewParams.InvoiceItem#extraParams} for the field documentation.
       */
      public Builder putExtraParam(String key, Object value) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.put(key, value);
        return this;
      }

      /**
       * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
       * `put/putAll` call, and subsequent calls add additional key/value pairs to the original map.
       * See {@link InvoiceCreatePreviewParams.InvoiceItem#extraParams} for the field documentation.
       */
      public Builder putAllExtraParam(Map map) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.putAll(map);
        return this;
      }

      /**
       * The ID of the invoice item to update in preview. If not specified, a new invoice item will
       * be added to the preview of the upcoming invoice.
       */
      public Builder setInvoiceitem(String invoiceitem) {
        this.invoiceitem = invoiceitem;
        return this;
      }

      /**
       * Add a key/value pair to `metadata` map. A map is initialized for the first `put/putAll`
       * call, and subsequent calls add additional key/value pairs to the original map. See {@link
       * InvoiceCreatePreviewParams.InvoiceItem#metadata} for the field documentation.
       */
      @SuppressWarnings("unchecked")
      public Builder putMetadata(String key, String value) {
        if (this.metadata == null || this.metadata instanceof EmptyParam) {
          this.metadata = new HashMap();
        }
        ((Map) this.metadata).put(key, value);
        return this;
      }

      /**
       * Add all map key/value pairs to `metadata` map. A map is initialized for the first
       * `put/putAll` call, and subsequent calls add additional key/value pairs to the original map.
       * See {@link InvoiceCreatePreviewParams.InvoiceItem#metadata} for the field documentation.
       */
      @SuppressWarnings("unchecked")
      public Builder putAllMetadata(Map map) {
        if (this.metadata == null || this.metadata instanceof EmptyParam) {
          this.metadata = new HashMap();
        }
        ((Map) this.metadata).putAll(map);
        return this;
      }

      /**
       * Set of key-value pairs that you can
       * attach to an object. This can be useful for storing additional information about the object
       * in a structured format. Individual keys can be unset by posting an empty value to them. All
       * keys can be unset by posting an empty value to {@code metadata}.
       */
      public Builder setMetadata(EmptyParam metadata) {
        this.metadata = metadata;
        return this;
      }

      /**
       * Set of key-value pairs that you can
       * attach to an object. This can be useful for storing additional information about the object
       * in a structured format. Individual keys can be unset by posting an empty value to them. All
       * keys can be unset by posting an empty value to {@code metadata}.
       */
      public Builder setMetadata(Map metadata) {
        this.metadata = metadata;
        return this;
      }

      /**
       * The period associated with this invoice item. When set to different values, the period will
       * be rendered on the invoice. If you have Stripe Revenue Recognition enabled,
       * the period will be used to recognize and defer revenue. See the Revenue
       * Recognition documentation for details.
       */
      public Builder setPeriod(InvoiceCreatePreviewParams.InvoiceItem.Period period) {
        this.period = period;
        return this;
      }

      /** The ID of the price object. One of {@code price} or {@code price_data} is required. */
      public Builder setPrice(String price) {
        this.price = price;
        return this;
      }

      /**
       * Data used to generate a new Price object
       * inline. One of {@code price} or {@code price_data} is required.
       */
      public Builder setPriceData(InvoiceCreatePreviewParams.InvoiceItem.PriceData priceData) {
        this.priceData = priceData;
        return this;
      }

      /** Non-negative integer. The quantity of units for the invoice item. */
      public Builder setQuantity(Long quantity) {
        this.quantity = quantity;
        return this;
      }

      /**
       * Only required if a default
       * tax behavior was not provided in the Stripe Tax settings. Specifies whether the price
       * is considered inclusive of taxes or exclusive of taxes. One of {@code inclusive}, {@code
       * exclusive}, or {@code unspecified}. Once specified as either {@code inclusive} or {@code
       * exclusive}, it cannot be changed.
       */
      public Builder setTaxBehavior(
          InvoiceCreatePreviewParams.InvoiceItem.TaxBehavior taxBehavior) {
        this.taxBehavior = taxBehavior;
        return this;
      }

      /** A tax code ID. */
      public Builder setTaxCode(String taxCode) {
        this.taxCode = taxCode;
        return this;
      }

      /** A tax code ID. */
      public Builder setTaxCode(EmptyParam taxCode) {
        this.taxCode = taxCode;
        return this;
      }

      /**
       * Add an element to `taxRates` list. A list is initialized for the first `add/addAll` call,
       * and subsequent calls adds additional elements to the original list. See {@link
       * InvoiceCreatePreviewParams.InvoiceItem#taxRates} for the field documentation.
       */
      @SuppressWarnings("unchecked")
      public Builder addTaxRate(String element) {
        if (this.taxRates == null || this.taxRates instanceof EmptyParam) {
          this.taxRates = new ArrayList();
        }
        ((List) this.taxRates).add(element);
        return this;
      }

      /**
       * Add all elements to `taxRates` list. A list is initialized for the first `add/addAll` call,
       * and subsequent calls adds additional elements to the original list. See {@link
       * InvoiceCreatePreviewParams.InvoiceItem#taxRates} for the field documentation.
       */
      @SuppressWarnings("unchecked")
      public Builder addAllTaxRate(List elements) {
        if (this.taxRates == null || this.taxRates instanceof EmptyParam) {
          this.taxRates = new ArrayList();
        }
        ((List) this.taxRates).addAll(elements);
        return this;
      }

      /**
       * The tax rates that apply to the item. When set, any {@code default_tax_rates} do not apply
       * to this item.
       */
      public Builder setTaxRates(EmptyParam taxRates) {
        this.taxRates = taxRates;
        return this;
      }

      /**
       * The tax rates that apply to the item. When set, any {@code default_tax_rates} do not apply
       * to this item.
       */
      public Builder setTaxRates(List taxRates) {
        this.taxRates = taxRates;
        return this;
      }

      /**
       * The integer unit amount in cents (or local equivalent) of the charge to be applied to the
       * upcoming invoice. This unit_amount will be multiplied by the quantity to get the full
       * amount. If you want to apply a credit to the customer's account, pass a negative
       * unit_amount.
       */
      public Builder setUnitAmount(Long unitAmount) {
        this.unitAmount = unitAmount;
        return this;
      }

      /**
       * Same as {@code unit_amount}, but accepts a decimal value in cents (or local equivalent)
       * with at most 12 decimal places. Only one of {@code unit_amount} and {@code
       * unit_amount_decimal} can be set.
       */
      public Builder setUnitAmountDecimal(BigDecimal unitAmountDecimal) {
        this.unitAmountDecimal = unitAmountDecimal;
        return this;
      }
    }

    @Getter
    public static class Discount {
      /** ID of the coupon to create a new discount for. */
      @SerializedName("coupon")
      String coupon;

      /** ID of an existing discount on the object (or one of its ancestors) to reuse. */
      @SerializedName("discount")
      String discount;

      /**
       * Map of extra parameters for custom features not available in this client library. The
       * content in this map is not serialized under this field's {@code @SerializedName} value.
       * Instead, each key/value pair is serialized as if the key is a root-level field (serialized)
       * name in this param object. Effectively, this map is flattened to its parent instance.
       */
      @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
      Map extraParams;

      /** ID of the promotion code to create a new discount for. */
      @SerializedName("promotion_code")
      String promotionCode;

      private Discount(
          String coupon, String discount, Map extraParams, String promotionCode) {
        this.coupon = coupon;
        this.discount = discount;
        this.extraParams = extraParams;
        this.promotionCode = promotionCode;
      }

      public static Builder builder() {
        return new Builder();
      }

      public static class Builder {
        private String coupon;

        private String discount;

        private Map extraParams;

        private String promotionCode;

        /** Finalize and obtain parameter instance from this builder. */
        public InvoiceCreatePreviewParams.InvoiceItem.Discount build() {
          return new InvoiceCreatePreviewParams.InvoiceItem.Discount(
              this.coupon, this.discount, this.extraParams, this.promotionCode);
        }

        /** ID of the coupon to create a new discount for. */
        public Builder setCoupon(String coupon) {
          this.coupon = coupon;
          return this;
        }

        /** ID of an existing discount on the object (or one of its ancestors) to reuse. */
        public Builder setDiscount(String discount) {
          this.discount = discount;
          return this;
        }

        /**
         * Add a key/value pair to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.InvoiceItem.Discount#extraParams} for the
         * field documentation.
         */
        public Builder putExtraParam(String key, Object value) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.put(key, value);
          return this;
        }

        /**
         * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.InvoiceItem.Discount#extraParams} for the
         * field documentation.
         */
        public Builder putAllExtraParam(Map map) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.putAll(map);
          return this;
        }

        /** ID of the promotion code to create a new discount for. */
        public Builder setPromotionCode(String promotionCode) {
          this.promotionCode = promotionCode;
          return this;
        }
      }
    }

    @Getter
    public static class Period {
      /**
       * Required. The end of the period, which must be greater than or equal to
       * the start. This value is inclusive.
       */
      @SerializedName("end")
      Long end;

      /**
       * Map of extra parameters for custom features not available in this client library. The
       * content in this map is not serialized under this field's {@code @SerializedName} value.
       * Instead, each key/value pair is serialized as if the key is a root-level field (serialized)
       * name in this param object. Effectively, this map is flattened to its parent instance.
       */
      @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
      Map extraParams;

      /** Required. The start of the period. This value is inclusive. */
      @SerializedName("start")
      Long start;

      private Period(Long end, Map extraParams, Long start) {
        this.end = end;
        this.extraParams = extraParams;
        this.start = start;
      }

      public static Builder builder() {
        return new Builder();
      }

      public static class Builder {
        private Long end;

        private Map extraParams;

        private Long start;

        /** Finalize and obtain parameter instance from this builder. */
        public InvoiceCreatePreviewParams.InvoiceItem.Period build() {
          return new InvoiceCreatePreviewParams.InvoiceItem.Period(
              this.end, this.extraParams, this.start);
        }

        /**
         * Required. The end of the period, which must be greater than or equal to
         * the start. This value is inclusive.
         */
        public Builder setEnd(Long end) {
          this.end = end;
          return this;
        }

        /**
         * Add a key/value pair to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.InvoiceItem.Period#extraParams} for the field
         * documentation.
         */
        public Builder putExtraParam(String key, Object value) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.put(key, value);
          return this;
        }

        /**
         * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.InvoiceItem.Period#extraParams} for the field
         * documentation.
         */
        public Builder putAllExtraParam(Map map) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.putAll(map);
          return this;
        }

        /** Required. The start of the period. This value is inclusive. */
        public Builder setStart(Long start) {
          this.start = start;
          return this;
        }
      }
    }

    @Getter
    public static class PriceData {
      /**
       * Required. Three-letter ISO currency code, in
       * lowercase. Must be a supported currency.
       */
      @SerializedName("currency")
      String currency;

      /**
       * Map of extra parameters for custom features not available in this client library. The
       * content in this map is not serialized under this field's {@code @SerializedName} value.
       * Instead, each key/value pair is serialized as if the key is a root-level field (serialized)
       * name in this param object. Effectively, this map is flattened to its parent instance.
       */
      @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
      Map extraParams;

      /** Required. The ID of the product that this price will belong to. */
      @SerializedName("product")
      String product;

      /**
       * Only required if a default
       * tax behavior was not provided in the Stripe Tax settings. Specifies whether the price
       * is considered inclusive of taxes or exclusive of taxes. One of {@code inclusive}, {@code
       * exclusive}, or {@code unspecified}. Once specified as either {@code inclusive} or {@code
       * exclusive}, it cannot be changed.
       */
      @SerializedName("tax_behavior")
      TaxBehavior taxBehavior;

      /**
       * A positive integer in cents (or local equivalent) (or 0 for a free price) representing how
       * much to charge.
       */
      @SerializedName("unit_amount")
      Long unitAmount;

      /**
       * Same as {@code unit_amount}, but accepts a decimal value in cents (or local equivalent)
       * with at most 12 decimal places. Only one of {@code unit_amount} and {@code
       * unit_amount_decimal} can be set.
       */
      @SerializedName("unit_amount_decimal")
      BigDecimal unitAmountDecimal;

      private PriceData(
          String currency,
          Map extraParams,
          String product,
          TaxBehavior taxBehavior,
          Long unitAmount,
          BigDecimal unitAmountDecimal) {
        this.currency = currency;
        this.extraParams = extraParams;
        this.product = product;
        this.taxBehavior = taxBehavior;
        this.unitAmount = unitAmount;
        this.unitAmountDecimal = unitAmountDecimal;
      }

      public static Builder builder() {
        return new Builder();
      }

      public static class Builder {
        private String currency;

        private Map extraParams;

        private String product;

        private TaxBehavior taxBehavior;

        private Long unitAmount;

        private BigDecimal unitAmountDecimal;

        /** Finalize and obtain parameter instance from this builder. */
        public InvoiceCreatePreviewParams.InvoiceItem.PriceData build() {
          return new InvoiceCreatePreviewParams.InvoiceItem.PriceData(
              this.currency,
              this.extraParams,
              this.product,
              this.taxBehavior,
              this.unitAmount,
              this.unitAmountDecimal);
        }

        /**
         * Required. Three-letter ISO currency code, in
         * lowercase. Must be a supported currency.
         */
        public Builder setCurrency(String currency) {
          this.currency = currency;
          return this;
        }

        /**
         * Add a key/value pair to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.InvoiceItem.PriceData#extraParams} for the
         * field documentation.
         */
        public Builder putExtraParam(String key, Object value) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.put(key, value);
          return this;
        }

        /**
         * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.InvoiceItem.PriceData#extraParams} for the
         * field documentation.
         */
        public Builder putAllExtraParam(Map map) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.putAll(map);
          return this;
        }

        /** Required. The ID of the product that this price will belong to. */
        public Builder setProduct(String product) {
          this.product = product;
          return this;
        }

        /**
         * Only required if a default
         * tax behavior was not provided in the Stripe Tax settings. Specifies whether the price
         * is considered inclusive of taxes or exclusive of taxes. One of {@code inclusive}, {@code
         * exclusive}, or {@code unspecified}. Once specified as either {@code inclusive} or {@code
         * exclusive}, it cannot be changed.
         */
        public Builder setTaxBehavior(
            InvoiceCreatePreviewParams.InvoiceItem.PriceData.TaxBehavior taxBehavior) {
          this.taxBehavior = taxBehavior;
          return this;
        }

        /**
         * A positive integer in cents (or local equivalent) (or 0 for a free price) representing
         * how much to charge.
         */
        public Builder setUnitAmount(Long unitAmount) {
          this.unitAmount = unitAmount;
          return this;
        }

        /**
         * Same as {@code unit_amount}, but accepts a decimal value in cents (or local equivalent)
         * with at most 12 decimal places. Only one of {@code unit_amount} and {@code
         * unit_amount_decimal} can be set.
         */
        public Builder setUnitAmountDecimal(BigDecimal unitAmountDecimal) {
          this.unitAmountDecimal = unitAmountDecimal;
          return this;
        }
      }

      public enum TaxBehavior implements ApiRequestParams.EnumParam {
        @SerializedName("exclusive")
        EXCLUSIVE("exclusive"),

        @SerializedName("inclusive")
        INCLUSIVE("inclusive"),

        @SerializedName("unspecified")
        UNSPECIFIED("unspecified");

        @Getter(onMethod_ = {@Override})
        private final String value;

        TaxBehavior(String value) {
          this.value = value;
        }
      }
    }

    public enum TaxBehavior implements ApiRequestParams.EnumParam {
      @SerializedName("exclusive")
      EXCLUSIVE("exclusive"),

      @SerializedName("inclusive")
      INCLUSIVE("inclusive"),

      @SerializedName("unspecified")
      UNSPECIFIED("unspecified");

      @Getter(onMethod_ = {@Override})
      private final String value;

      TaxBehavior(String value) {
        this.value = value;
      }
    }
  }

  @Getter
  public static class Issuer {
    /** The connected account being referenced when {@code type} is {@code account}. */
    @SerializedName("account")
    String account;

    /**
     * Map of extra parameters for custom features not available in this client library. The content
     * in this map is not serialized under this field's {@code @SerializedName} value. Instead, each
     * key/value pair is serialized as if the key is a root-level field (serialized) name in this
     * param object. Effectively, this map is flattened to its parent instance.
     */
    @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
    Map extraParams;

    /** Required. Type of the account referenced in the request. */
    @SerializedName("type")
    Type type;

    private Issuer(String account, Map extraParams, Type type) {
      this.account = account;
      this.extraParams = extraParams;
      this.type = type;
    }

    public static Builder builder() {
      return new Builder();
    }

    public static class Builder {
      private String account;

      private Map extraParams;

      private Type type;

      /** Finalize and obtain parameter instance from this builder. */
      public InvoiceCreatePreviewParams.Issuer build() {
        return new InvoiceCreatePreviewParams.Issuer(this.account, this.extraParams, this.type);
      }

      /** The connected account being referenced when {@code type} is {@code account}. */
      public Builder setAccount(String account) {
        this.account = account;
        return this;
      }

      /**
       * Add a key/value pair to `extraParams` map. A map is initialized for the first `put/putAll`
       * call, and subsequent calls add additional key/value pairs to the original map. See {@link
       * InvoiceCreatePreviewParams.Issuer#extraParams} for the field documentation.
       */
      public Builder putExtraParam(String key, Object value) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.put(key, value);
        return this;
      }

      /**
       * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
       * `put/putAll` call, and subsequent calls add additional key/value pairs to the original map.
       * See {@link InvoiceCreatePreviewParams.Issuer#extraParams} for the field documentation.
       */
      public Builder putAllExtraParam(Map map) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.putAll(map);
        return this;
      }

      /** Required. Type of the account referenced in the request. */
      public Builder setType(InvoiceCreatePreviewParams.Issuer.Type type) {
        this.type = type;
        return this;
      }
    }

    public enum Type implements ApiRequestParams.EnumParam {
      @SerializedName("account")
      ACCOUNT("account"),

      @SerializedName("self")
      SELF("self");

      @Getter(onMethod_ = {@Override})
      private final String value;

      Type(String value) {
        this.value = value;
      }
    }
  }

  @Getter
  public static class ScheduleDetails {
    /**
     * Behavior of the subscription schedule and underlying subscription when it ends. Possible
     * values are {@code release} or {@code cancel} with the default being {@code release}. {@code
     * release} will end the subscription schedule and keep the underlying subscription running.
     * {@code cancel} will end the subscription schedule and cancel the underlying subscription.
     */
    @SerializedName("end_behavior")
    EndBehavior endBehavior;

    /**
     * Map of extra parameters for custom features not available in this client library. The content
     * in this map is not serialized under this field's {@code @SerializedName} value. Instead, each
     * key/value pair is serialized as if the key is a root-level field (serialized) name in this
     * param object. Effectively, this map is flattened to its parent instance.
     */
    @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
    Map extraParams;

    /**
     * List representing phases of the subscription schedule. Each phase can be customized to have
     * different durations, plans, and coupons. If there are multiple phases, the {@code end_date}
     * of one phase will always equal the {@code start_date} of the next phase.
     */
    @SerializedName("phases")
    List phases;

    /**
     * In cases where the {@code schedule_details} params update the currently active phase,
     * specifies if and how to prorate at the time of the request.
     */
    @SerializedName("proration_behavior")
    ProrationBehavior prorationBehavior;

    private ScheduleDetails(
        EndBehavior endBehavior,
        Map extraParams,
        List phases,
        ProrationBehavior prorationBehavior) {
      this.endBehavior = endBehavior;
      this.extraParams = extraParams;
      this.phases = phases;
      this.prorationBehavior = prorationBehavior;
    }

    public static Builder builder() {
      return new Builder();
    }

    public static class Builder {
      private EndBehavior endBehavior;

      private Map extraParams;

      private List phases;

      private ProrationBehavior prorationBehavior;

      /** Finalize and obtain parameter instance from this builder. */
      public InvoiceCreatePreviewParams.ScheduleDetails build() {
        return new InvoiceCreatePreviewParams.ScheduleDetails(
            this.endBehavior, this.extraParams, this.phases, this.prorationBehavior);
      }

      /**
       * Behavior of the subscription schedule and underlying subscription when it ends. Possible
       * values are {@code release} or {@code cancel} with the default being {@code release}. {@code
       * release} will end the subscription schedule and keep the underlying subscription running.
       * {@code cancel} will end the subscription schedule and cancel the underlying subscription.
       */
      public Builder setEndBehavior(
          InvoiceCreatePreviewParams.ScheduleDetails.EndBehavior endBehavior) {
        this.endBehavior = endBehavior;
        return this;
      }

      /**
       * Add a key/value pair to `extraParams` map. A map is initialized for the first `put/putAll`
       * call, and subsequent calls add additional key/value pairs to the original map. See {@link
       * InvoiceCreatePreviewParams.ScheduleDetails#extraParams} for the field documentation.
       */
      public Builder putExtraParam(String key, Object value) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.put(key, value);
        return this;
      }

      /**
       * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
       * `put/putAll` call, and subsequent calls add additional key/value pairs to the original map.
       * See {@link InvoiceCreatePreviewParams.ScheduleDetails#extraParams} for the field
       * documentation.
       */
      public Builder putAllExtraParam(Map map) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.putAll(map);
        return this;
      }

      /**
       * Add an element to `phases` list. A list is initialized for the first `add/addAll` call, and
       * subsequent calls adds additional elements to the original list. See {@link
       * InvoiceCreatePreviewParams.ScheduleDetails#phases} for the field documentation.
       */
      public Builder addPhase(InvoiceCreatePreviewParams.ScheduleDetails.Phase element) {
        if (this.phases == null) {
          this.phases = new ArrayList<>();
        }
        this.phases.add(element);
        return this;
      }

      /**
       * Add all elements to `phases` list. A list is initialized for the first `add/addAll` call,
       * and subsequent calls adds additional elements to the original list. See {@link
       * InvoiceCreatePreviewParams.ScheduleDetails#phases} for the field documentation.
       */
      public Builder addAllPhase(List elements) {
        if (this.phases == null) {
          this.phases = new ArrayList<>();
        }
        this.phases.addAll(elements);
        return this;
      }

      /**
       * In cases where the {@code schedule_details} params update the currently active phase,
       * specifies if and how to prorate at the time of the request.
       */
      public Builder setProrationBehavior(
          InvoiceCreatePreviewParams.ScheduleDetails.ProrationBehavior prorationBehavior) {
        this.prorationBehavior = prorationBehavior;
        return this;
      }
    }

    @Getter
    public static class Phase {
      /**
       * A list of prices and quantities that will generate invoice items appended to the next
       * invoice for this phase. You may pass up to 20 items.
       */
      @SerializedName("add_invoice_items")
      List addInvoiceItems;

      /**
       * A non-negative decimal between 0 and 100, with at most two decimal places. This represents
       * the percentage of the subscription invoice total that will be transferred to the
       * application owner's Stripe account. The request must be made by a platform account on a
       * connected account in order to set an application fee percentage. For more information, see
       * the application fees documentation.
       */
      @SerializedName("application_fee_percent")
      BigDecimal applicationFeePercent;

      /** Automatic tax settings for this phase. */
      @SerializedName("automatic_tax")
      AutomaticTax automaticTax;

      /**
       * Can be set to {@code phase_start} to set the anchor to the start of the phase or {@code
       * automatic} to automatically change it if needed. Cannot be set to {@code phase_start} if
       * this phase specifies a trial. For more information, see the billing cycle documentation.
       */
      @SerializedName("billing_cycle_anchor")
      BillingCycleAnchor billingCycleAnchor;

      /**
       * Define thresholds at which an invoice will be sent, and the subscription advanced to a new
       * billing period. Pass an empty string to remove previously-defined thresholds.
       */
      @SerializedName("billing_thresholds")
      Object billingThresholds;

      /**
       * Either {@code charge_automatically}, or {@code send_invoice}. When charging automatically,
       * Stripe will attempt to pay the underlying subscription at the end of each billing cycle
       * using the default source attached to the customer. When sending an invoice, Stripe will
       * email your customer an invoice with payment instructions and mark the subscription as
       * {@code active}. Defaults to {@code charge_automatically} on creation.
       */
      @SerializedName("collection_method")
      CollectionMethod collectionMethod;

      /**
       * The ID of the coupon to apply to this phase of the subscription schedule. This field has
       * been deprecated and will be removed in a future API version. Use {@code discounts} instead.
       */
      @SerializedName("coupon")
      String coupon;

      /**
       * Three-letter ISO currency
       * code, in lowercase. Must be a supported
       * currency.
       */
      @SerializedName("currency")
      String currency;

      /**
       * ID of the default payment method for the subscription schedule. It must belong to the
       * customer associated with the subscription schedule. If not set, invoices will use the
       * default payment method in the customer's invoice settings.
       */
      @SerializedName("default_payment_method")
      String defaultPaymentMethod;

      /**
       * A list of Tax Rate ids. These Tax Rates
       * will set the Subscription's {@code
       * default_tax_rates}, which means they will be the Invoice's {@code
       * default_tax_rates} for any Invoices issued by the Subscription during this Phase.
       */
      @SerializedName("default_tax_rates")
      Object defaultTaxRates;

      /**
       * Subscription description, meant to be displayable to the customer. Use this field to
       * optionally store an explanation of the subscription for rendering in Stripe surfaces and
       * certain local payment methods UIs.
       */
      @SerializedName("description")
      Object description;

      /**
       * The coupons to redeem into discounts for the schedule phase. If not specified, inherits the
       * discount from the subscription's customer. Pass an empty string to avoid inheriting any
       * discounts.
       */
      @SerializedName("discounts")
      Object discounts;

      /**
       * The date at which this phase of the subscription schedule ends. If set, {@code iterations}
       * must not be set.
       */
      @SerializedName("end_date")
      Object endDate;

      /**
       * Map of extra parameters for custom features not available in this client library. The
       * content in this map is not serialized under this field's {@code @SerializedName} value.
       * Instead, each key/value pair is serialized as if the key is a root-level field (serialized)
       * name in this param object. Effectively, this map is flattened to its parent instance.
       */
      @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
      Map extraParams;

      /** All invoices will be billed using the specified settings. */
      @SerializedName("invoice_settings")
      InvoiceSettings invoiceSettings;

      /**
       * Required. List of configuration items, each with an attached price, to
       * apply during this phase of the subscription schedule.
       */
      @SerializedName("items")
      List items;

      /**
       * Integer representing the multiplier applied to the price interval. For example, {@code
       * iterations=2} applied to a price with {@code interval=month} and {@code interval_count=3}
       * results in a phase of duration {@code 2 * 3 months = 6 months}. If set, {@code end_date}
       * must not be set.
       */
      @SerializedName("iterations")
      Long iterations;

      /**
       * Set of key-value pairs that you can
       * attach to a phase. Metadata on a schedule's phase will update the underlying subscription's
       * {@code metadata} when the phase is entered, adding new keys and replacing existing keys in
       * the subscription's {@code metadata}. Individual keys in the subscription's {@code metadata}
       * can be unset by posting an empty value to them in the phase's {@code metadata}. To unset
       * all keys in the subscription's {@code metadata}, update the subscription directly or unset
       * every key individually from the phase's {@code metadata}.
       */
      @SerializedName("metadata")
      Map metadata;

      /**
       * The account on behalf of which to charge, for each of the associated subscription's
       * invoices.
       */
      @SerializedName("on_behalf_of")
      String onBehalfOf;

      /**
       * Whether the subscription schedule will create prorations when
       * transitioning to this phase. The default value is {@code create_prorations}. This setting
       * controls prorations when a phase is started asynchronously and it is persisted as a field
       * on the phase. It's different from the request-level proration_behavior
       * parameter which controls what happens if the update request affects the billing
       * configuration of the current phase.
       */
      @SerializedName("proration_behavior")
      ProrationBehavior prorationBehavior;

      /**
       * The date at which this phase of the subscription schedule starts or {@code now}. Must be
       * set on the first phase.
       */
      @SerializedName("start_date")
      Object startDate;

      /**
       * The data with which to automatically create a Transfer for each of the associated
       * subscription's invoices.
       */
      @SerializedName("transfer_data")
      TransferData transferData;

      /**
       * If set to true the entire phase is counted as a trial and the customer will not be charged
       * for any fees.
       */
      @SerializedName("trial")
      Boolean trial;

      /**
       * Sets the phase to trialing from the start date to this date. Must be before the phase end
       * date, can not be combined with {@code trial}
       */
      @SerializedName("trial_end")
      Object trialEnd;

      private Phase(
          List addInvoiceItems,
          BigDecimal applicationFeePercent,
          AutomaticTax automaticTax,
          BillingCycleAnchor billingCycleAnchor,
          Object billingThresholds,
          CollectionMethod collectionMethod,
          String coupon,
          String currency,
          String defaultPaymentMethod,
          Object defaultTaxRates,
          Object description,
          Object discounts,
          Object endDate,
          Map extraParams,
          InvoiceSettings invoiceSettings,
          List items,
          Long iterations,
          Map metadata,
          String onBehalfOf,
          ProrationBehavior prorationBehavior,
          Object startDate,
          TransferData transferData,
          Boolean trial,
          Object trialEnd) {
        this.addInvoiceItems = addInvoiceItems;
        this.applicationFeePercent = applicationFeePercent;
        this.automaticTax = automaticTax;
        this.billingCycleAnchor = billingCycleAnchor;
        this.billingThresholds = billingThresholds;
        this.collectionMethod = collectionMethod;
        this.coupon = coupon;
        this.currency = currency;
        this.defaultPaymentMethod = defaultPaymentMethod;
        this.defaultTaxRates = defaultTaxRates;
        this.description = description;
        this.discounts = discounts;
        this.endDate = endDate;
        this.extraParams = extraParams;
        this.invoiceSettings = invoiceSettings;
        this.items = items;
        this.iterations = iterations;
        this.metadata = metadata;
        this.onBehalfOf = onBehalfOf;
        this.prorationBehavior = prorationBehavior;
        this.startDate = startDate;
        this.transferData = transferData;
        this.trial = trial;
        this.trialEnd = trialEnd;
      }

      public static Builder builder() {
        return new Builder();
      }

      public static class Builder {
        private List
            addInvoiceItems;

        private BigDecimal applicationFeePercent;

        private AutomaticTax automaticTax;

        private BillingCycleAnchor billingCycleAnchor;

        private Object billingThresholds;

        private CollectionMethod collectionMethod;

        private String coupon;

        private String currency;

        private String defaultPaymentMethod;

        private Object defaultTaxRates;

        private Object description;

        private Object discounts;

        private Object endDate;

        private Map extraParams;

        private InvoiceSettings invoiceSettings;

        private List items;

        private Long iterations;

        private Map metadata;

        private String onBehalfOf;

        private ProrationBehavior prorationBehavior;

        private Object startDate;

        private TransferData transferData;

        private Boolean trial;

        private Object trialEnd;

        /** Finalize and obtain parameter instance from this builder. */
        public InvoiceCreatePreviewParams.ScheduleDetails.Phase build() {
          return new InvoiceCreatePreviewParams.ScheduleDetails.Phase(
              this.addInvoiceItems,
              this.applicationFeePercent,
              this.automaticTax,
              this.billingCycleAnchor,
              this.billingThresholds,
              this.collectionMethod,
              this.coupon,
              this.currency,
              this.defaultPaymentMethod,
              this.defaultTaxRates,
              this.description,
              this.discounts,
              this.endDate,
              this.extraParams,
              this.invoiceSettings,
              this.items,
              this.iterations,
              this.metadata,
              this.onBehalfOf,
              this.prorationBehavior,
              this.startDate,
              this.transferData,
              this.trial,
              this.trialEnd);
        }

        /**
         * Add an element to `addInvoiceItems` list. A list is initialized for the first
         * `add/addAll` call, and subsequent calls adds additional elements to the original list.
         * See {@link InvoiceCreatePreviewParams.ScheduleDetails.Phase#addInvoiceItems} for the
         * field documentation.
         */
        public Builder addAddInvoiceItem(
            InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem element) {
          if (this.addInvoiceItems == null) {
            this.addInvoiceItems = new ArrayList<>();
          }
          this.addInvoiceItems.add(element);
          return this;
        }

        /**
         * Add all elements to `addInvoiceItems` list. A list is initialized for the first
         * `add/addAll` call, and subsequent calls adds additional elements to the original list.
         * See {@link InvoiceCreatePreviewParams.ScheduleDetails.Phase#addInvoiceItems} for the
         * field documentation.
         */
        public Builder addAllAddInvoiceItem(
            List elements) {
          if (this.addInvoiceItems == null) {
            this.addInvoiceItems = new ArrayList<>();
          }
          this.addInvoiceItems.addAll(elements);
          return this;
        }

        /**
         * A non-negative decimal between 0 and 100, with at most two decimal places. This
         * represents the percentage of the subscription invoice total that will be transferred to
         * the application owner's Stripe account. The request must be made by a platform account on
         * a connected account in order to set an application fee percentage. For more information,
         * see the application fees documentation.
         */
        public Builder setApplicationFeePercent(BigDecimal applicationFeePercent) {
          this.applicationFeePercent = applicationFeePercent;
          return this;
        }

        /** Automatic tax settings for this phase. */
        public Builder setAutomaticTax(
            InvoiceCreatePreviewParams.ScheduleDetails.Phase.AutomaticTax automaticTax) {
          this.automaticTax = automaticTax;
          return this;
        }

        /**
         * Can be set to {@code phase_start} to set the anchor to the start of the phase or {@code
         * automatic} to automatically change it if needed. Cannot be set to {@code phase_start} if
         * this phase specifies a trial. For more information, see the billing cycle documentation.
         */
        public Builder setBillingCycleAnchor(
            InvoiceCreatePreviewParams.ScheduleDetails.Phase.BillingCycleAnchor
                billingCycleAnchor) {
          this.billingCycleAnchor = billingCycleAnchor;
          return this;
        }

        /**
         * Define thresholds at which an invoice will be sent, and the subscription advanced to a
         * new billing period. Pass an empty string to remove previously-defined thresholds.
         */
        public Builder setBillingThresholds(
            InvoiceCreatePreviewParams.ScheduleDetails.Phase.BillingThresholds billingThresholds) {
          this.billingThresholds = billingThresholds;
          return this;
        }

        /**
         * Define thresholds at which an invoice will be sent, and the subscription advanced to a
         * new billing period. Pass an empty string to remove previously-defined thresholds.
         */
        public Builder setBillingThresholds(EmptyParam billingThresholds) {
          this.billingThresholds = billingThresholds;
          return this;
        }

        /**
         * Either {@code charge_automatically}, or {@code send_invoice}. When charging
         * automatically, Stripe will attempt to pay the underlying subscription at the end of each
         * billing cycle using the default source attached to the customer. When sending an invoice,
         * Stripe will email your customer an invoice with payment instructions and mark the
         * subscription as {@code active}. Defaults to {@code charge_automatically} on creation.
         */
        public Builder setCollectionMethod(
            InvoiceCreatePreviewParams.ScheduleDetails.Phase.CollectionMethod collectionMethod) {
          this.collectionMethod = collectionMethod;
          return this;
        }

        /**
         * The ID of the coupon to apply to this phase of the subscription schedule. This field has
         * been deprecated and will be removed in a future API version. Use {@code discounts}
         * instead.
         */
        public Builder setCoupon(String coupon) {
          this.coupon = coupon;
          return this;
        }

        /**
         * Three-letter ISO currency
         * code, in lowercase. Must be a supported
         * currency.
         */
        public Builder setCurrency(String currency) {
          this.currency = currency;
          return this;
        }

        /**
         * ID of the default payment method for the subscription schedule. It must belong to the
         * customer associated with the subscription schedule. If not set, invoices will use the
         * default payment method in the customer's invoice settings.
         */
        public Builder setDefaultPaymentMethod(String defaultPaymentMethod) {
          this.defaultPaymentMethod = defaultPaymentMethod;
          return this;
        }

        /**
         * Add an element to `defaultTaxRates` list. A list is initialized for the first
         * `add/addAll` call, and subsequent calls adds additional elements to the original list.
         * See {@link InvoiceCreatePreviewParams.ScheduleDetails.Phase#defaultTaxRates} for the
         * field documentation.
         */
        @SuppressWarnings("unchecked")
        public Builder addDefaultTaxRate(String element) {
          if (this.defaultTaxRates == null || this.defaultTaxRates instanceof EmptyParam) {
            this.defaultTaxRates = new ArrayList();
          }
          ((List) this.defaultTaxRates).add(element);
          return this;
        }

        /**
         * Add all elements to `defaultTaxRates` list. A list is initialized for the first
         * `add/addAll` call, and subsequent calls adds additional elements to the original list.
         * See {@link InvoiceCreatePreviewParams.ScheduleDetails.Phase#defaultTaxRates} for the
         * field documentation.
         */
        @SuppressWarnings("unchecked")
        public Builder addAllDefaultTaxRate(List elements) {
          if (this.defaultTaxRates == null || this.defaultTaxRates instanceof EmptyParam) {
            this.defaultTaxRates = new ArrayList();
          }
          ((List) this.defaultTaxRates).addAll(elements);
          return this;
        }

        /**
         * A list of Tax Rate ids. These Tax
         * Rates will set the Subscription's {@code
         * default_tax_rates}, which means they will be the Invoice's {@code
         * default_tax_rates} for any Invoices issued by the Subscription during this Phase.
         */
        public Builder setDefaultTaxRates(EmptyParam defaultTaxRates) {
          this.defaultTaxRates = defaultTaxRates;
          return this;
        }

        /**
         * A list of Tax Rate ids. These Tax
         * Rates will set the Subscription's {@code
         * default_tax_rates}, which means they will be the Invoice's {@code
         * default_tax_rates} for any Invoices issued by the Subscription during this Phase.
         */
        public Builder setDefaultTaxRates(List defaultTaxRates) {
          this.defaultTaxRates = defaultTaxRates;
          return this;
        }

        /**
         * Subscription description, meant to be displayable to the customer. Use this field to
         * optionally store an explanation of the subscription for rendering in Stripe surfaces and
         * certain local payment methods UIs.
         */
        public Builder setDescription(String description) {
          this.description = description;
          return this;
        }

        /**
         * Subscription description, meant to be displayable to the customer. Use this field to
         * optionally store an explanation of the subscription for rendering in Stripe surfaces and
         * certain local payment methods UIs.
         */
        public Builder setDescription(EmptyParam description) {
          this.description = description;
          return this;
        }

        /**
         * Add an element to `discounts` list. A list is initialized for the first `add/addAll`
         * call, and subsequent calls adds additional elements to the original list. See {@link
         * InvoiceCreatePreviewParams.ScheduleDetails.Phase#discounts} for the field documentation.
         */
        @SuppressWarnings("unchecked")
        public Builder addDiscount(
            InvoiceCreatePreviewParams.ScheduleDetails.Phase.Discount element) {
          if (this.discounts == null || this.discounts instanceof EmptyParam) {
            this.discounts =
                new ArrayList();
          }
          ((List) this.discounts)
              .add(element);
          return this;
        }

        /**
         * Add all elements to `discounts` list. A list is initialized for the first `add/addAll`
         * call, and subsequent calls adds additional elements to the original list. See {@link
         * InvoiceCreatePreviewParams.ScheduleDetails.Phase#discounts} for the field documentation.
         */
        @SuppressWarnings("unchecked")
        public Builder addAllDiscount(
            List elements) {
          if (this.discounts == null || this.discounts instanceof EmptyParam) {
            this.discounts =
                new ArrayList();
          }
          ((List) this.discounts)
              .addAll(elements);
          return this;
        }

        /**
         * The coupons to redeem into discounts for the schedule phase. If not specified, inherits
         * the discount from the subscription's customer. Pass an empty string to avoid inheriting
         * any discounts.
         */
        public Builder setDiscounts(EmptyParam discounts) {
          this.discounts = discounts;
          return this;
        }

        /**
         * The coupons to redeem into discounts for the schedule phase. If not specified, inherits
         * the discount from the subscription's customer. Pass an empty string to avoid inheriting
         * any discounts.
         */
        public Builder setDiscounts(
            List discounts) {
          this.discounts = discounts;
          return this;
        }

        /**
         * The date at which this phase of the subscription schedule ends. If set, {@code
         * iterations} must not be set.
         */
        public Builder setEndDate(Long endDate) {
          this.endDate = endDate;
          return this;
        }

        /**
         * The date at which this phase of the subscription schedule ends. If set, {@code
         * iterations} must not be set.
         */
        public Builder setEndDate(
            InvoiceCreatePreviewParams.ScheduleDetails.Phase.EndDate endDate) {
          this.endDate = endDate;
          return this;
        }

        /**
         * Add a key/value pair to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.ScheduleDetails.Phase#extraParams} for the
         * field documentation.
         */
        public Builder putExtraParam(String key, Object value) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.put(key, value);
          return this;
        }

        /**
         * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.ScheduleDetails.Phase#extraParams} for the
         * field documentation.
         */
        public Builder putAllExtraParam(Map map) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.putAll(map);
          return this;
        }

        /** All invoices will be billed using the specified settings. */
        public Builder setInvoiceSettings(
            InvoiceCreatePreviewParams.ScheduleDetails.Phase.InvoiceSettings invoiceSettings) {
          this.invoiceSettings = invoiceSettings;
          return this;
        }

        /**
         * Add an element to `items` list. A list is initialized for the first `add/addAll` call,
         * and subsequent calls adds additional elements to the original list. See {@link
         * InvoiceCreatePreviewParams.ScheduleDetails.Phase#items} for the field documentation.
         */
        public Builder addItem(InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item element) {
          if (this.items == null) {
            this.items = new ArrayList<>();
          }
          this.items.add(element);
          return this;
        }

        /**
         * Add all elements to `items` list. A list is initialized for the first `add/addAll` call,
         * and subsequent calls adds additional elements to the original list. See {@link
         * InvoiceCreatePreviewParams.ScheduleDetails.Phase#items} for the field documentation.
         */
        public Builder addAllItem(
            List elements) {
          if (this.items == null) {
            this.items = new ArrayList<>();
          }
          this.items.addAll(elements);
          return this;
        }

        /**
         * Integer representing the multiplier applied to the price interval. For example, {@code
         * iterations=2} applied to a price with {@code interval=month} and {@code interval_count=3}
         * results in a phase of duration {@code 2 * 3 months = 6 months}. If set, {@code end_date}
         * must not be set.
         */
        public Builder setIterations(Long iterations) {
          this.iterations = iterations;
          return this;
        }

        /**
         * Add a key/value pair to `metadata` map. A map is initialized for the first `put/putAll`
         * call, and subsequent calls add additional key/value pairs to the original map. See {@link
         * InvoiceCreatePreviewParams.ScheduleDetails.Phase#metadata} for the field documentation.
         */
        public Builder putMetadata(String key, String value) {
          if (this.metadata == null) {
            this.metadata = new HashMap<>();
          }
          this.metadata.put(key, value);
          return this;
        }

        /**
         * Add all map key/value pairs to `metadata` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.ScheduleDetails.Phase#metadata} for the field
         * documentation.
         */
        public Builder putAllMetadata(Map map) {
          if (this.metadata == null) {
            this.metadata = new HashMap<>();
          }
          this.metadata.putAll(map);
          return this;
        }

        /**
         * The account on behalf of which to charge, for each of the associated subscription's
         * invoices.
         */
        public Builder setOnBehalfOf(String onBehalfOf) {
          this.onBehalfOf = onBehalfOf;
          return this;
        }

        /**
         * Whether the subscription schedule will create prorations when
         * transitioning to this phase. The default value is {@code create_prorations}. This setting
         * controls prorations when a phase is started asynchronously and it is persisted as a field
         * on the phase. It's different from the request-level proration_behavior
         * parameter which controls what happens if the update request affects the billing
         * configuration of the current phase.
         */
        public Builder setProrationBehavior(
            InvoiceCreatePreviewParams.ScheduleDetails.Phase.ProrationBehavior prorationBehavior) {
          this.prorationBehavior = prorationBehavior;
          return this;
        }

        /**
         * The date at which this phase of the subscription schedule starts or {@code now}. Must be
         * set on the first phase.
         */
        public Builder setStartDate(Long startDate) {
          this.startDate = startDate;
          return this;
        }

        /**
         * The date at which this phase of the subscription schedule starts or {@code now}. Must be
         * set on the first phase.
         */
        public Builder setStartDate(
            InvoiceCreatePreviewParams.ScheduleDetails.Phase.StartDate startDate) {
          this.startDate = startDate;
          return this;
        }

        /**
         * The data with which to automatically create a Transfer for each of the associated
         * subscription's invoices.
         */
        public Builder setTransferData(
            InvoiceCreatePreviewParams.ScheduleDetails.Phase.TransferData transferData) {
          this.transferData = transferData;
          return this;
        }

        /**
         * If set to true the entire phase is counted as a trial and the customer will not be
         * charged for any fees.
         */
        public Builder setTrial(Boolean trial) {
          this.trial = trial;
          return this;
        }

        /**
         * Sets the phase to trialing from the start date to this date. Must be before the phase end
         * date, can not be combined with {@code trial}
         */
        public Builder setTrialEnd(Long trialEnd) {
          this.trialEnd = trialEnd;
          return this;
        }

        /**
         * Sets the phase to trialing from the start date to this date. Must be before the phase end
         * date, can not be combined with {@code trial}
         */
        public Builder setTrialEnd(
            InvoiceCreatePreviewParams.ScheduleDetails.Phase.TrialEnd trialEnd) {
          this.trialEnd = trialEnd;
          return this;
        }
      }

      @Getter
      public static class AddInvoiceItem {
        /** The coupons to redeem into discounts for the item. */
        @SerializedName("discounts")
        List discounts;

        /**
         * Map of extra parameters for custom features not available in this client library. The
         * content in this map is not serialized under this field's {@code @SerializedName} value.
         * Instead, each key/value pair is serialized as if the key is a root-level field
         * (serialized) name in this param object. Effectively, this map is flattened to its parent
         * instance.
         */
        @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
        Map extraParams;

        /** The ID of the price object. One of {@code price} or {@code price_data} is required. */
        @SerializedName("price")
        String price;

        /**
         * Data used to generate a new Price object
         * inline. One of {@code price} or {@code price_data} is required.
         */
        @SerializedName("price_data")
        PriceData priceData;

        /** Quantity for this item. Defaults to 1. */
        @SerializedName("quantity")
        Long quantity;

        /**
         * The tax rates which apply to the item. When set, the {@code default_tax_rates} do not
         * apply to this item.
         */
        @SerializedName("tax_rates")
        Object taxRates;

        private AddInvoiceItem(
            List
                discounts,
            Map extraParams,
            String price,
            PriceData priceData,
            Long quantity,
            Object taxRates) {
          this.discounts = discounts;
          this.extraParams = extraParams;
          this.price = price;
          this.priceData = priceData;
          this.quantity = quantity;
          this.taxRates = taxRates;
        }

        public static Builder builder() {
          return new Builder();
        }

        public static class Builder {
          private List
              discounts;

          private Map extraParams;

          private String price;

          private PriceData priceData;

          private Long quantity;

          private Object taxRates;

          /** Finalize and obtain parameter instance from this builder. */
          public InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem build() {
            return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem(
                this.discounts,
                this.extraParams,
                this.price,
                this.priceData,
                this.quantity,
                this.taxRates);
          }

          /**
           * Add an element to `discounts` list. A list is initialized for the first `add/addAll`
           * call, and subsequent calls adds additional elements to the original list. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem#discounts} for the
           * field documentation.
           */
          public Builder addDiscount(
              InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem.Discount element) {
            if (this.discounts == null) {
              this.discounts = new ArrayList<>();
            }
            this.discounts.add(element);
            return this;
          }

          /**
           * Add all elements to `discounts` list. A list is initialized for the first `add/addAll`
           * call, and subsequent calls adds additional elements to the original list. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem#discounts} for the
           * field documentation.
           */
          public Builder addAllDiscount(
              List
                  elements) {
            if (this.discounts == null) {
              this.discounts = new ArrayList<>();
            }
            this.discounts.addAll(elements);
            return this;
          }

          /**
           * Add a key/value pair to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem#extraParams} for the
           * field documentation.
           */
          public Builder putExtraParam(String key, Object value) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.put(key, value);
            return this;
          }

          /**
           * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem#extraParams} for the
           * field documentation.
           */
          public Builder putAllExtraParam(Map map) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.putAll(map);
            return this;
          }

          /** The ID of the price object. One of {@code price} or {@code price_data} is required. */
          public Builder setPrice(String price) {
            this.price = price;
            return this;
          }

          /**
           * Data used to generate a new Price
           * object inline. One of {@code price} or {@code price_data} is required.
           */
          public Builder setPriceData(
              InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem.PriceData priceData) {
            this.priceData = priceData;
            return this;
          }

          /** Quantity for this item. Defaults to 1. */
          public Builder setQuantity(Long quantity) {
            this.quantity = quantity;
            return this;
          }

          /**
           * Add an element to `taxRates` list. A list is initialized for the first `add/addAll`
           * call, and subsequent calls adds additional elements to the original list. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem#taxRates} for the field
           * documentation.
           */
          @SuppressWarnings("unchecked")
          public Builder addTaxRate(String element) {
            if (this.taxRates == null || this.taxRates instanceof EmptyParam) {
              this.taxRates = new ArrayList();
            }
            ((List) this.taxRates).add(element);
            return this;
          }

          /**
           * Add all elements to `taxRates` list. A list is initialized for the first `add/addAll`
           * call, and subsequent calls adds additional elements to the original list. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem#taxRates} for the field
           * documentation.
           */
          @SuppressWarnings("unchecked")
          public Builder addAllTaxRate(List elements) {
            if (this.taxRates == null || this.taxRates instanceof EmptyParam) {
              this.taxRates = new ArrayList();
            }
            ((List) this.taxRates).addAll(elements);
            return this;
          }

          /**
           * The tax rates which apply to the item. When set, the {@code default_tax_rates} do not
           * apply to this item.
           */
          public Builder setTaxRates(EmptyParam taxRates) {
            this.taxRates = taxRates;
            return this;
          }

          /**
           * The tax rates which apply to the item. When set, the {@code default_tax_rates} do not
           * apply to this item.
           */
          public Builder setTaxRates(List taxRates) {
            this.taxRates = taxRates;
            return this;
          }
        }

        @Getter
        public static class Discount {
          /** ID of the coupon to create a new discount for. */
          @SerializedName("coupon")
          String coupon;

          /** ID of an existing discount on the object (or one of its ancestors) to reuse. */
          @SerializedName("discount")
          String discount;

          /**
           * Map of extra parameters for custom features not available in this client library. The
           * content in this map is not serialized under this field's {@code @SerializedName} value.
           * Instead, each key/value pair is serialized as if the key is a root-level field
           * (serialized) name in this param object. Effectively, this map is flattened to its
           * parent instance.
           */
          @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
          Map extraParams;

          /** ID of the promotion code to create a new discount for. */
          @SerializedName("promotion_code")
          String promotionCode;

          private Discount(
              String coupon,
              String discount,
              Map extraParams,
              String promotionCode) {
            this.coupon = coupon;
            this.discount = discount;
            this.extraParams = extraParams;
            this.promotionCode = promotionCode;
          }

          public static Builder builder() {
            return new Builder();
          }

          public static class Builder {
            private String coupon;

            private String discount;

            private Map extraParams;

            private String promotionCode;

            /** Finalize and obtain parameter instance from this builder. */
            public InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem.Discount
                build() {
              return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem.Discount(
                  this.coupon, this.discount, this.extraParams, this.promotionCode);
            }

            /** ID of the coupon to create a new discount for. */
            public Builder setCoupon(String coupon) {
              this.coupon = coupon;
              return this;
            }

            /** ID of an existing discount on the object (or one of its ancestors) to reuse. */
            public Builder setDiscount(String discount) {
              this.discount = discount;
              return this;
            }

            /**
             * Add a key/value pair to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem.Discount#extraParams}
             * for the field documentation.
             */
            public Builder putExtraParam(String key, Object value) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.put(key, value);
              return this;
            }

            /**
             * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem.Discount#extraParams}
             * for the field documentation.
             */
            public Builder putAllExtraParam(Map map) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.putAll(map);
              return this;
            }

            /** ID of the promotion code to create a new discount for. */
            public Builder setPromotionCode(String promotionCode) {
              this.promotionCode = promotionCode;
              return this;
            }
          }
        }

        @Getter
        public static class PriceData {
          /**
           * Required. Three-letter ISO currency code, in
           * lowercase. Must be a supported
           * currency.
           */
          @SerializedName("currency")
          String currency;

          /**
           * Map of extra parameters for custom features not available in this client library. The
           * content in this map is not serialized under this field's {@code @SerializedName} value.
           * Instead, each key/value pair is serialized as if the key is a root-level field
           * (serialized) name in this param object. Effectively, this map is flattened to its
           * parent instance.
           */
          @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
          Map extraParams;

          /** Required. The ID of the product that this price will belong to. */
          @SerializedName("product")
          String product;

          /**
           * Only required if a default
           * tax behavior was not provided in the Stripe Tax settings. Specifies whether the
           * price is considered inclusive of taxes or exclusive of taxes. One of {@code inclusive},
           * {@code exclusive}, or {@code unspecified}. Once specified as either {@code inclusive}
           * or {@code exclusive}, it cannot be changed.
           */
          @SerializedName("tax_behavior")
          TaxBehavior taxBehavior;

          /**
           * A positive integer in cents (or local equivalent) (or 0 for a free price) representing
           * how much to charge.
           */
          @SerializedName("unit_amount")
          Long unitAmount;

          /**
           * Same as {@code unit_amount}, but accepts a decimal value in cents (or local equivalent)
           * with at most 12 decimal places. Only one of {@code unit_amount} and {@code
           * unit_amount_decimal} can be set.
           */
          @SerializedName("unit_amount_decimal")
          BigDecimal unitAmountDecimal;

          private PriceData(
              String currency,
              Map extraParams,
              String product,
              TaxBehavior taxBehavior,
              Long unitAmount,
              BigDecimal unitAmountDecimal) {
            this.currency = currency;
            this.extraParams = extraParams;
            this.product = product;
            this.taxBehavior = taxBehavior;
            this.unitAmount = unitAmount;
            this.unitAmountDecimal = unitAmountDecimal;
          }

          public static Builder builder() {
            return new Builder();
          }

          public static class Builder {
            private String currency;

            private Map extraParams;

            private String product;

            private TaxBehavior taxBehavior;

            private Long unitAmount;

            private BigDecimal unitAmountDecimal;

            /** Finalize and obtain parameter instance from this builder. */
            public InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem.PriceData
                build() {
              return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem.PriceData(
                  this.currency,
                  this.extraParams,
                  this.product,
                  this.taxBehavior,
                  this.unitAmount,
                  this.unitAmountDecimal);
            }

            /**
             * Required. Three-letter ISO currency code, in
             * lowercase. Must be a supported
             * currency.
             */
            public Builder setCurrency(String currency) {
              this.currency = currency;
              return this;
            }

            /**
             * Add a key/value pair to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem.PriceData#extraParams}
             * for the field documentation.
             */
            public Builder putExtraParam(String key, Object value) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.put(key, value);
              return this;
            }

            /**
             * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem.PriceData#extraParams}
             * for the field documentation.
             */
            public Builder putAllExtraParam(Map map) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.putAll(map);
              return this;
            }

            /** Required. The ID of the product that this price will belong to. */
            public Builder setProduct(String product) {
              this.product = product;
              return this;
            }

            /**
             * Only required if a default
             * tax behavior was not provided in the Stripe Tax settings. Specifies whether the
             * price is considered inclusive of taxes or exclusive of taxes. One of {@code
             * inclusive}, {@code exclusive}, or {@code unspecified}. Once specified as either
             * {@code inclusive} or {@code exclusive}, it cannot be changed.
             */
            public Builder setTaxBehavior(
                InvoiceCreatePreviewParams.ScheduleDetails.Phase.AddInvoiceItem.PriceData
                        .TaxBehavior
                    taxBehavior) {
              this.taxBehavior = taxBehavior;
              return this;
            }

            /**
             * A positive integer in cents (or local equivalent) (or 0 for a free price)
             * representing how much to charge.
             */
            public Builder setUnitAmount(Long unitAmount) {
              this.unitAmount = unitAmount;
              return this;
            }

            /**
             * Same as {@code unit_amount}, but accepts a decimal value in cents (or local
             * equivalent) with at most 12 decimal places. Only one of {@code unit_amount} and
             * {@code unit_amount_decimal} can be set.
             */
            public Builder setUnitAmountDecimal(BigDecimal unitAmountDecimal) {
              this.unitAmountDecimal = unitAmountDecimal;
              return this;
            }
          }

          public enum TaxBehavior implements ApiRequestParams.EnumParam {
            @SerializedName("exclusive")
            EXCLUSIVE("exclusive"),

            @SerializedName("inclusive")
            INCLUSIVE("inclusive"),

            @SerializedName("unspecified")
            UNSPECIFIED("unspecified");

            @Getter(onMethod_ = {@Override})
            private final String value;

            TaxBehavior(String value) {
              this.value = value;
            }
          }
        }
      }

      @Getter
      public static class AutomaticTax {
        /**
         * Required. Enabled automatic tax calculation which will automatically
         * compute tax rates on all invoices generated by the subscription.
         */
        @SerializedName("enabled")
        Boolean enabled;

        /**
         * Map of extra parameters for custom features not available in this client library. The
         * content in this map is not serialized under this field's {@code @SerializedName} value.
         * Instead, each key/value pair is serialized as if the key is a root-level field
         * (serialized) name in this param object. Effectively, this map is flattened to its parent
         * instance.
         */
        @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
        Map extraParams;

        /**
         * The account that's liable for tax. If set, the business address and tax registrations
         * required to perform the tax calculation are loaded from this account. The tax transaction
         * is returned in the report of the connected account.
         */
        @SerializedName("liability")
        Liability liability;

        private AutomaticTax(
            Boolean enabled, Map extraParams, Liability liability) {
          this.enabled = enabled;
          this.extraParams = extraParams;
          this.liability = liability;
        }

        public static Builder builder() {
          return new Builder();
        }

        public static class Builder {
          private Boolean enabled;

          private Map extraParams;

          private Liability liability;

          /** Finalize and obtain parameter instance from this builder. */
          public InvoiceCreatePreviewParams.ScheduleDetails.Phase.AutomaticTax build() {
            return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.AutomaticTax(
                this.enabled, this.extraParams, this.liability);
          }

          /**
           * Required. Enabled automatic tax calculation which will automatically
           * compute tax rates on all invoices generated by the subscription.
           */
          public Builder setEnabled(Boolean enabled) {
            this.enabled = enabled;
            return this;
          }

          /**
           * Add a key/value pair to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AutomaticTax#extraParams} for the
           * field documentation.
           */
          public Builder putExtraParam(String key, Object value) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.put(key, value);
            return this;
          }

          /**
           * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AutomaticTax#extraParams} for the
           * field documentation.
           */
          public Builder putAllExtraParam(Map map) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.putAll(map);
            return this;
          }

          /**
           * The account that's liable for tax. If set, the business address and tax registrations
           * required to perform the tax calculation are loaded from this account. The tax
           * transaction is returned in the report of the connected account.
           */
          public Builder setLiability(
              InvoiceCreatePreviewParams.ScheduleDetails.Phase.AutomaticTax.Liability liability) {
            this.liability = liability;
            return this;
          }
        }

        @Getter
        public static class Liability {
          /** The connected account being referenced when {@code type} is {@code account}. */
          @SerializedName("account")
          String account;

          /**
           * Map of extra parameters for custom features not available in this client library. The
           * content in this map is not serialized under this field's {@code @SerializedName} value.
           * Instead, each key/value pair is serialized as if the key is a root-level field
           * (serialized) name in this param object. Effectively, this map is flattened to its
           * parent instance.
           */
          @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
          Map extraParams;

          /** Required. Type of the account referenced in the request. */
          @SerializedName("type")
          Type type;

          private Liability(String account, Map extraParams, Type type) {
            this.account = account;
            this.extraParams = extraParams;
            this.type = type;
          }

          public static Builder builder() {
            return new Builder();
          }

          public static class Builder {
            private String account;

            private Map extraParams;

            private Type type;

            /** Finalize and obtain parameter instance from this builder. */
            public InvoiceCreatePreviewParams.ScheduleDetails.Phase.AutomaticTax.Liability build() {
              return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.AutomaticTax.Liability(
                  this.account, this.extraParams, this.type);
            }

            /** The connected account being referenced when {@code type} is {@code account}. */
            public Builder setAccount(String account) {
              this.account = account;
              return this;
            }

            /**
             * Add a key/value pair to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AutomaticTax.Liability#extraParams}
             * for the field documentation.
             */
            public Builder putExtraParam(String key, Object value) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.put(key, value);
              return this;
            }

            /**
             * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.AutomaticTax.Liability#extraParams}
             * for the field documentation.
             */
            public Builder putAllExtraParam(Map map) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.putAll(map);
              return this;
            }

            /** Required. Type of the account referenced in the request. */
            public Builder setType(
                InvoiceCreatePreviewParams.ScheduleDetails.Phase.AutomaticTax.Liability.Type type) {
              this.type = type;
              return this;
            }
          }

          public enum Type implements ApiRequestParams.EnumParam {
            @SerializedName("account")
            ACCOUNT("account"),

            @SerializedName("self")
            SELF("self");

            @Getter(onMethod_ = {@Override})
            private final String value;

            Type(String value) {
              this.value = value;
            }
          }
        }
      }

      @Getter
      public static class BillingThresholds {
        /** Monetary threshold that triggers the subscription to advance to a new billing period. */
        @SerializedName("amount_gte")
        Long amountGte;

        /**
         * Map of extra parameters for custom features not available in this client library. The
         * content in this map is not serialized under this field's {@code @SerializedName} value.
         * Instead, each key/value pair is serialized as if the key is a root-level field
         * (serialized) name in this param object. Effectively, this map is flattened to its parent
         * instance.
         */
        @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
        Map extraParams;

        /**
         * Indicates if the {@code billing_cycle_anchor} should be reset when a threshold is
         * reached. If true, {@code billing_cycle_anchor} will be updated to the date/time the
         * threshold was last reached; otherwise, the value will remain unchanged.
         */
        @SerializedName("reset_billing_cycle_anchor")
        Boolean resetBillingCycleAnchor;

        private BillingThresholds(
            Long amountGte, Map extraParams, Boolean resetBillingCycleAnchor) {
          this.amountGte = amountGte;
          this.extraParams = extraParams;
          this.resetBillingCycleAnchor = resetBillingCycleAnchor;
        }

        public static Builder builder() {
          return new Builder();
        }

        public static class Builder {
          private Long amountGte;

          private Map extraParams;

          private Boolean resetBillingCycleAnchor;

          /** Finalize and obtain parameter instance from this builder. */
          public InvoiceCreatePreviewParams.ScheduleDetails.Phase.BillingThresholds build() {
            return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.BillingThresholds(
                this.amountGte, this.extraParams, this.resetBillingCycleAnchor);
          }

          /**
           * Monetary threshold that triggers the subscription to advance to a new billing period.
           */
          public Builder setAmountGte(Long amountGte) {
            this.amountGte = amountGte;
            return this;
          }

          /**
           * Add a key/value pair to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.BillingThresholds#extraParams} for the
           * field documentation.
           */
          public Builder putExtraParam(String key, Object value) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.put(key, value);
            return this;
          }

          /**
           * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.BillingThresholds#extraParams} for the
           * field documentation.
           */
          public Builder putAllExtraParam(Map map) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.putAll(map);
            return this;
          }

          /**
           * Indicates if the {@code billing_cycle_anchor} should be reset when a threshold is
           * reached. If true, {@code billing_cycle_anchor} will be updated to the date/time the
           * threshold was last reached; otherwise, the value will remain unchanged.
           */
          public Builder setResetBillingCycleAnchor(Boolean resetBillingCycleAnchor) {
            this.resetBillingCycleAnchor = resetBillingCycleAnchor;
            return this;
          }
        }
      }

      @Getter
      public static class Discount {
        /** ID of the coupon to create a new discount for. */
        @SerializedName("coupon")
        String coupon;

        /** ID of an existing discount on the object (or one of its ancestors) to reuse. */
        @SerializedName("discount")
        String discount;

        /**
         * Map of extra parameters for custom features not available in this client library. The
         * content in this map is not serialized under this field's {@code @SerializedName} value.
         * Instead, each key/value pair is serialized as if the key is a root-level field
         * (serialized) name in this param object. Effectively, this map is flattened to its parent
         * instance.
         */
        @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
        Map extraParams;

        /** ID of the promotion code to create a new discount for. */
        @SerializedName("promotion_code")
        String promotionCode;

        private Discount(
            String coupon, String discount, Map extraParams, String promotionCode) {
          this.coupon = coupon;
          this.discount = discount;
          this.extraParams = extraParams;
          this.promotionCode = promotionCode;
        }

        public static Builder builder() {
          return new Builder();
        }

        public static class Builder {
          private String coupon;

          private String discount;

          private Map extraParams;

          private String promotionCode;

          /** Finalize and obtain parameter instance from this builder. */
          public InvoiceCreatePreviewParams.ScheduleDetails.Phase.Discount build() {
            return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.Discount(
                this.coupon, this.discount, this.extraParams, this.promotionCode);
          }

          /** ID of the coupon to create a new discount for. */
          public Builder setCoupon(String coupon) {
            this.coupon = coupon;
            return this;
          }

          /** ID of an existing discount on the object (or one of its ancestors) to reuse. */
          public Builder setDiscount(String discount) {
            this.discount = discount;
            return this;
          }

          /**
           * Add a key/value pair to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link InvoiceCreatePreviewParams.ScheduleDetails.Phase.Discount#extraParams}
           * for the field documentation.
           */
          public Builder putExtraParam(String key, Object value) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.put(key, value);
            return this;
          }

          /**
           * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link InvoiceCreatePreviewParams.ScheduleDetails.Phase.Discount#extraParams}
           * for the field documentation.
           */
          public Builder putAllExtraParam(Map map) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.putAll(map);
            return this;
          }

          /** ID of the promotion code to create a new discount for. */
          public Builder setPromotionCode(String promotionCode) {
            this.promotionCode = promotionCode;
            return this;
          }
        }
      }

      @Getter
      public static class InvoiceSettings {
        /**
         * The account tax IDs associated with this phase of the subscription schedule. Will be set
         * on invoices generated by this phase of the subscription schedule.
         */
        @SerializedName("account_tax_ids")
        Object accountTaxIds;

        /**
         * Number of days within which a customer must pay invoices generated by this subscription
         * schedule. This value will be {@code null} for subscription schedules where {@code
         * billing=charge_automatically}.
         */
        @SerializedName("days_until_due")
        Long daysUntilDue;

        /**
         * Map of extra parameters for custom features not available in this client library. The
         * content in this map is not serialized under this field's {@code @SerializedName} value.
         * Instead, each key/value pair is serialized as if the key is a root-level field
         * (serialized) name in this param object. Effectively, this map is flattened to its parent
         * instance.
         */
        @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
        Map extraParams;

        /**
         * The connected account that issues the invoice. The invoice is presented with the branding
         * and support information of the specified account.
         */
        @SerializedName("issuer")
        Issuer issuer;

        private InvoiceSettings(
            Object accountTaxIds,
            Long daysUntilDue,
            Map extraParams,
            Issuer issuer) {
          this.accountTaxIds = accountTaxIds;
          this.daysUntilDue = daysUntilDue;
          this.extraParams = extraParams;
          this.issuer = issuer;
        }

        public static Builder builder() {
          return new Builder();
        }

        public static class Builder {
          private Object accountTaxIds;

          private Long daysUntilDue;

          private Map extraParams;

          private Issuer issuer;

          /** Finalize and obtain parameter instance from this builder. */
          public InvoiceCreatePreviewParams.ScheduleDetails.Phase.InvoiceSettings build() {
            return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.InvoiceSettings(
                this.accountTaxIds, this.daysUntilDue, this.extraParams, this.issuer);
          }

          /**
           * Add an element to `accountTaxIds` list. A list is initialized for the first
           * `add/addAll` call, and subsequent calls adds additional elements to the original list.
           * See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.InvoiceSettings#accountTaxIds} for the
           * field documentation.
           */
          @SuppressWarnings("unchecked")
          public Builder addAccountTaxId(String element) {
            if (this.accountTaxIds == null || this.accountTaxIds instanceof EmptyParam) {
              this.accountTaxIds = new ArrayList();
            }
            ((List) this.accountTaxIds).add(element);
            return this;
          }

          /**
           * Add all elements to `accountTaxIds` list. A list is initialized for the first
           * `add/addAll` call, and subsequent calls adds additional elements to the original list.
           * See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.InvoiceSettings#accountTaxIds} for the
           * field documentation.
           */
          @SuppressWarnings("unchecked")
          public Builder addAllAccountTaxId(List elements) {
            if (this.accountTaxIds == null || this.accountTaxIds instanceof EmptyParam) {
              this.accountTaxIds = new ArrayList();
            }
            ((List) this.accountTaxIds).addAll(elements);
            return this;
          }

          /**
           * The account tax IDs associated with this phase of the subscription schedule. Will be
           * set on invoices generated by this phase of the subscription schedule.
           */
          public Builder setAccountTaxIds(EmptyParam accountTaxIds) {
            this.accountTaxIds = accountTaxIds;
            return this;
          }

          /**
           * The account tax IDs associated with this phase of the subscription schedule. Will be
           * set on invoices generated by this phase of the subscription schedule.
           */
          public Builder setAccountTaxIds(List accountTaxIds) {
            this.accountTaxIds = accountTaxIds;
            return this;
          }

          /**
           * Number of days within which a customer must pay invoices generated by this subscription
           * schedule. This value will be {@code null} for subscription schedules where {@code
           * billing=charge_automatically}.
           */
          public Builder setDaysUntilDue(Long daysUntilDue) {
            this.daysUntilDue = daysUntilDue;
            return this;
          }

          /**
           * Add a key/value pair to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.InvoiceSettings#extraParams} for the
           * field documentation.
           */
          public Builder putExtraParam(String key, Object value) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.put(key, value);
            return this;
          }

          /**
           * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.InvoiceSettings#extraParams} for the
           * field documentation.
           */
          public Builder putAllExtraParam(Map map) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.putAll(map);
            return this;
          }

          /**
           * The connected account that issues the invoice. The invoice is presented with the
           * branding and support information of the specified account.
           */
          public Builder setIssuer(
              InvoiceCreatePreviewParams.ScheduleDetails.Phase.InvoiceSettings.Issuer issuer) {
            this.issuer = issuer;
            return this;
          }
        }

        @Getter
        public static class Issuer {
          /** The connected account being referenced when {@code type} is {@code account}. */
          @SerializedName("account")
          String account;

          /**
           * Map of extra parameters for custom features not available in this client library. The
           * content in this map is not serialized under this field's {@code @SerializedName} value.
           * Instead, each key/value pair is serialized as if the key is a root-level field
           * (serialized) name in this param object. Effectively, this map is flattened to its
           * parent instance.
           */
          @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
          Map extraParams;

          /** Required. Type of the account referenced in the request. */
          @SerializedName("type")
          Type type;

          private Issuer(String account, Map extraParams, Type type) {
            this.account = account;
            this.extraParams = extraParams;
            this.type = type;
          }

          public static Builder builder() {
            return new Builder();
          }

          public static class Builder {
            private String account;

            private Map extraParams;

            private Type type;

            /** Finalize and obtain parameter instance from this builder. */
            public InvoiceCreatePreviewParams.ScheduleDetails.Phase.InvoiceSettings.Issuer build() {
              return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.InvoiceSettings.Issuer(
                  this.account, this.extraParams, this.type);
            }

            /** The connected account being referenced when {@code type} is {@code account}. */
            public Builder setAccount(String account) {
              this.account = account;
              return this;
            }

            /**
             * Add a key/value pair to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.InvoiceSettings.Issuer#extraParams}
             * for the field documentation.
             */
            public Builder putExtraParam(String key, Object value) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.put(key, value);
              return this;
            }

            /**
             * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.InvoiceSettings.Issuer#extraParams}
             * for the field documentation.
             */
            public Builder putAllExtraParam(Map map) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.putAll(map);
              return this;
            }

            /** Required. Type of the account referenced in the request. */
            public Builder setType(
                InvoiceCreatePreviewParams.ScheduleDetails.Phase.InvoiceSettings.Issuer.Type type) {
              this.type = type;
              return this;
            }
          }

          public enum Type implements ApiRequestParams.EnumParam {
            @SerializedName("account")
            ACCOUNT("account"),

            @SerializedName("self")
            SELF("self");

            @Getter(onMethod_ = {@Override})
            private final String value;

            Type(String value) {
              this.value = value;
            }
          }
        }
      }

      @Getter
      public static class Item {
        /**
         * Define thresholds at which an invoice will be sent, and the subscription advanced to a
         * new billing period. When updating, pass an empty string to remove previously-defined
         * thresholds.
         */
        @SerializedName("billing_thresholds")
        Object billingThresholds;

        /** The coupons to redeem into discounts for the subscription item. */
        @SerializedName("discounts")
        Object discounts;

        /**
         * Map of extra parameters for custom features not available in this client library. The
         * content in this map is not serialized under this field's {@code @SerializedName} value.
         * Instead, each key/value pair is serialized as if the key is a root-level field
         * (serialized) name in this param object. Effectively, this map is flattened to its parent
         * instance.
         */
        @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
        Map extraParams;

        /**
         * Set of key-value pairs that you can
         * attach to a configuration item. Metadata on a configuration item will update the
         * underlying subscription item's {@code metadata} when the phase is entered, adding new
         * keys and replacing existing keys. Individual keys in the subscription item's {@code
         * metadata} can be unset by posting an empty value to them in the configuration item's
         * {@code metadata}. To unset all keys in the subscription item's {@code metadata}, update
         * the subscription item directly or unset every key individually from the configuration
         * item's {@code metadata}.
         */
        @SerializedName("metadata")
        Map metadata;

        /**
         * The plan ID to subscribe to. You may specify the same ID in {@code plan} and {@code
         * price}.
         */
        @SerializedName("plan")
        String plan;

        /** The ID of the price object. */
        @SerializedName("price")
        String price;

        /**
         * Data used to generate a new Price object
         * inline.
         */
        @SerializedName("price_data")
        PriceData priceData;

        /**
         * Quantity for the given price. Can be set only if the price's {@code usage_type} is {@code
         * licensed} and not {@code metered}.
         */
        @SerializedName("quantity")
        Long quantity;

        /**
         * A list of Tax Rate ids. These Tax
         * Rates will override the {@code
         * default_tax_rates} on the Subscription. When updating, pass an empty string to remove
         * previously-defined tax rates.
         */
        @SerializedName("tax_rates")
        Object taxRates;

        private Item(
            Object billingThresholds,
            Object discounts,
            Map extraParams,
            Map metadata,
            String plan,
            String price,
            PriceData priceData,
            Long quantity,
            Object taxRates) {
          this.billingThresholds = billingThresholds;
          this.discounts = discounts;
          this.extraParams = extraParams;
          this.metadata = metadata;
          this.plan = plan;
          this.price = price;
          this.priceData = priceData;
          this.quantity = quantity;
          this.taxRates = taxRates;
        }

        public static Builder builder() {
          return new Builder();
        }

        public static class Builder {
          private Object billingThresholds;

          private Object discounts;

          private Map extraParams;

          private Map metadata;

          private String plan;

          private String price;

          private PriceData priceData;

          private Long quantity;

          private Object taxRates;

          /** Finalize and obtain parameter instance from this builder. */
          public InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item build() {
            return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item(
                this.billingThresholds,
                this.discounts,
                this.extraParams,
                this.metadata,
                this.plan,
                this.price,
                this.priceData,
                this.quantity,
                this.taxRates);
          }

          /**
           * Define thresholds at which an invoice will be sent, and the subscription advanced to a
           * new billing period. When updating, pass an empty string to remove previously-defined
           * thresholds.
           */
          public Builder setBillingThresholds(
              InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.BillingThresholds
                  billingThresholds) {
            this.billingThresholds = billingThresholds;
            return this;
          }

          /**
           * Define thresholds at which an invoice will be sent, and the subscription advanced to a
           * new billing period. When updating, pass an empty string to remove previously-defined
           * thresholds.
           */
          public Builder setBillingThresholds(EmptyParam billingThresholds) {
            this.billingThresholds = billingThresholds;
            return this;
          }

          /**
           * Add an element to `discounts` list. A list is initialized for the first `add/addAll`
           * call, and subsequent calls adds additional elements to the original list. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item#discounts} for the field
           * documentation.
           */
          @SuppressWarnings("unchecked")
          public Builder addDiscount(
              InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.Discount element) {
            if (this.discounts == null || this.discounts instanceof EmptyParam) {
              this.discounts =
                  new ArrayList();
            }
            ((List) this.discounts)
                .add(element);
            return this;
          }

          /**
           * Add all elements to `discounts` list. A list is initialized for the first `add/addAll`
           * call, and subsequent calls adds additional elements to the original list. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item#discounts} for the field
           * documentation.
           */
          @SuppressWarnings("unchecked")
          public Builder addAllDiscount(
              List elements) {
            if (this.discounts == null || this.discounts instanceof EmptyParam) {
              this.discounts =
                  new ArrayList();
            }
            ((List) this.discounts)
                .addAll(elements);
            return this;
          }

          /** The coupons to redeem into discounts for the subscription item. */
          public Builder setDiscounts(EmptyParam discounts) {
            this.discounts = discounts;
            return this;
          }

          /** The coupons to redeem into discounts for the subscription item. */
          public Builder setDiscounts(
              List discounts) {
            this.discounts = discounts;
            return this;
          }

          /**
           * Add a key/value pair to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item#extraParams} for
           * the field documentation.
           */
          public Builder putExtraParam(String key, Object value) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.put(key, value);
            return this;
          }

          /**
           * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item#extraParams} for
           * the field documentation.
           */
          public Builder putAllExtraParam(Map map) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.putAll(map);
            return this;
          }

          /**
           * Add a key/value pair to `metadata` map. A map is initialized for the first `put/putAll`
           * call, and subsequent calls add additional key/value pairs to the original map. See
           * {@link InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item#metadata} for the field
           * documentation.
           */
          public Builder putMetadata(String key, String value) {
            if (this.metadata == null) {
              this.metadata = new HashMap<>();
            }
            this.metadata.put(key, value);
            return this;
          }

          /**
           * Add all map key/value pairs to `metadata` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item#metadata} for the
           * field documentation.
           */
          public Builder putAllMetadata(Map map) {
            if (this.metadata == null) {
              this.metadata = new HashMap<>();
            }
            this.metadata.putAll(map);
            return this;
          }

          /**
           * The plan ID to subscribe to. You may specify the same ID in {@code plan} and {@code
           * price}.
           */
          public Builder setPlan(String plan) {
            this.plan = plan;
            return this;
          }

          /** The ID of the price object. */
          public Builder setPrice(String price) {
            this.price = price;
            return this;
          }

          /**
           * Data used to generate a new Price
           * object inline.
           */
          public Builder setPriceData(
              InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.PriceData priceData) {
            this.priceData = priceData;
            return this;
          }

          /**
           * Quantity for the given price. Can be set only if the price's {@code usage_type} is
           * {@code licensed} and not {@code metered}.
           */
          public Builder setQuantity(Long quantity) {
            this.quantity = quantity;
            return this;
          }

          /**
           * Add an element to `taxRates` list. A list is initialized for the first `add/addAll`
           * call, and subsequent calls adds additional elements to the original list. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item#taxRates} for the field
           * documentation.
           */
          @SuppressWarnings("unchecked")
          public Builder addTaxRate(String element) {
            if (this.taxRates == null || this.taxRates instanceof EmptyParam) {
              this.taxRates = new ArrayList();
            }
            ((List) this.taxRates).add(element);
            return this;
          }

          /**
           * Add all elements to `taxRates` list. A list is initialized for the first `add/addAll`
           * call, and subsequent calls adds additional elements to the original list. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item#taxRates} for the field
           * documentation.
           */
          @SuppressWarnings("unchecked")
          public Builder addAllTaxRate(List elements) {
            if (this.taxRates == null || this.taxRates instanceof EmptyParam) {
              this.taxRates = new ArrayList();
            }
            ((List) this.taxRates).addAll(elements);
            return this;
          }

          /**
           * A list of Tax Rate ids. These Tax
           * Rates will override the {@code
           * default_tax_rates} on the Subscription. When updating, pass an empty string to
           * remove previously-defined tax rates.
           */
          public Builder setTaxRates(EmptyParam taxRates) {
            this.taxRates = taxRates;
            return this;
          }

          /**
           * A list of Tax Rate ids. These Tax
           * Rates will override the {@code
           * default_tax_rates} on the Subscription. When updating, pass an empty string to
           * remove previously-defined tax rates.
           */
          public Builder setTaxRates(List taxRates) {
            this.taxRates = taxRates;
            return this;
          }
        }

        @Getter
        public static class BillingThresholds {
          /**
           * Map of extra parameters for custom features not available in this client library. The
           * content in this map is not serialized under this field's {@code @SerializedName} value.
           * Instead, each key/value pair is serialized as if the key is a root-level field
           * (serialized) name in this param object. Effectively, this map is flattened to its
           * parent instance.
           */
          @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
          Map extraParams;

          /**
           * Required. Number of units that meets the billing threshold to advance
           * the subscription to a new billing period (e.g., it takes 10 $5 units to meet a $50 monetary
           * threshold)
           */
          @SerializedName("usage_gte")
          Long usageGte;

          private BillingThresholds(Map extraParams, Long usageGte) {
            this.extraParams = extraParams;
            this.usageGte = usageGte;
          }

          public static Builder builder() {
            return new Builder();
          }

          public static class Builder {
            private Map extraParams;

            private Long usageGte;

            /** Finalize and obtain parameter instance from this builder. */
            public InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.BillingThresholds build() {
              return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.BillingThresholds(
                  this.extraParams, this.usageGte);
            }

            /**
             * Add a key/value pair to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.BillingThresholds#extraParams}
             * for the field documentation.
             */
            public Builder putExtraParam(String key, Object value) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.put(key, value);
              return this;
            }

            /**
             * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.BillingThresholds#extraParams}
             * for the field documentation.
             */
            public Builder putAllExtraParam(Map map) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.putAll(map);
              return this;
            }

            /**
             * Required. Number of units that meets the billing threshold to
             * advance the subscription to a new billing period (e.g., it takes 10 $5 units to meet
             * a $50 monetary
             * threshold)
             */
            public Builder setUsageGte(Long usageGte) {
              this.usageGte = usageGte;
              return this;
            }
          }
        }

        @Getter
        public static class Discount {
          /** ID of the coupon to create a new discount for. */
          @SerializedName("coupon")
          String coupon;

          /** ID of an existing discount on the object (or one of its ancestors) to reuse. */
          @SerializedName("discount")
          String discount;

          /**
           * Map of extra parameters for custom features not available in this client library. The
           * content in this map is not serialized under this field's {@code @SerializedName} value.
           * Instead, each key/value pair is serialized as if the key is a root-level field
           * (serialized) name in this param object. Effectively, this map is flattened to its
           * parent instance.
           */
          @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
          Map extraParams;

          /** ID of the promotion code to create a new discount for. */
          @SerializedName("promotion_code")
          String promotionCode;

          private Discount(
              String coupon,
              String discount,
              Map extraParams,
              String promotionCode) {
            this.coupon = coupon;
            this.discount = discount;
            this.extraParams = extraParams;
            this.promotionCode = promotionCode;
          }

          public static Builder builder() {
            return new Builder();
          }

          public static class Builder {
            private String coupon;

            private String discount;

            private Map extraParams;

            private String promotionCode;

            /** Finalize and obtain parameter instance from this builder. */
            public InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.Discount build() {
              return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.Discount(
                  this.coupon, this.discount, this.extraParams, this.promotionCode);
            }

            /** ID of the coupon to create a new discount for. */
            public Builder setCoupon(String coupon) {
              this.coupon = coupon;
              return this;
            }

            /** ID of an existing discount on the object (or one of its ancestors) to reuse. */
            public Builder setDiscount(String discount) {
              this.discount = discount;
              return this;
            }

            /**
             * Add a key/value pair to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.Discount#extraParams} for the
             * field documentation.
             */
            public Builder putExtraParam(String key, Object value) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.put(key, value);
              return this;
            }

            /**
             * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.Discount#extraParams} for the
             * field documentation.
             */
            public Builder putAllExtraParam(Map map) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.putAll(map);
              return this;
            }

            /** ID of the promotion code to create a new discount for. */
            public Builder setPromotionCode(String promotionCode) {
              this.promotionCode = promotionCode;
              return this;
            }
          }
        }

        @Getter
        public static class PriceData {
          /**
           * Required. Three-letter ISO currency code, in
           * lowercase. Must be a supported
           * currency.
           */
          @SerializedName("currency")
          String currency;

          /**
           * Map of extra parameters for custom features not available in this client library. The
           * content in this map is not serialized under this field's {@code @SerializedName} value.
           * Instead, each key/value pair is serialized as if the key is a root-level field
           * (serialized) name in this param object. Effectively, this map is flattened to its
           * parent instance.
           */
          @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
          Map extraParams;

          /** Required. The ID of the product that this price will belong to. */
          @SerializedName("product")
          String product;

          /**
           * Required. The recurring components of a price such as {@code interval}
           * and {@code interval_count}.
           */
          @SerializedName("recurring")
          Recurring recurring;

          /**
           * Only required if a default
           * tax behavior was not provided in the Stripe Tax settings. Specifies whether the
           * price is considered inclusive of taxes or exclusive of taxes. One of {@code inclusive},
           * {@code exclusive}, or {@code unspecified}. Once specified as either {@code inclusive}
           * or {@code exclusive}, it cannot be changed.
           */
          @SerializedName("tax_behavior")
          TaxBehavior taxBehavior;

          /**
           * A positive integer in cents (or local equivalent) (or 0 for a free price) representing
           * how much to charge.
           */
          @SerializedName("unit_amount")
          Long unitAmount;

          /**
           * Same as {@code unit_amount}, but accepts a decimal value in cents (or local equivalent)
           * with at most 12 decimal places. Only one of {@code unit_amount} and {@code
           * unit_amount_decimal} can be set.
           */
          @SerializedName("unit_amount_decimal")
          BigDecimal unitAmountDecimal;

          private PriceData(
              String currency,
              Map extraParams,
              String product,
              Recurring recurring,
              TaxBehavior taxBehavior,
              Long unitAmount,
              BigDecimal unitAmountDecimal) {
            this.currency = currency;
            this.extraParams = extraParams;
            this.product = product;
            this.recurring = recurring;
            this.taxBehavior = taxBehavior;
            this.unitAmount = unitAmount;
            this.unitAmountDecimal = unitAmountDecimal;
          }

          public static Builder builder() {
            return new Builder();
          }

          public static class Builder {
            private String currency;

            private Map extraParams;

            private String product;

            private Recurring recurring;

            private TaxBehavior taxBehavior;

            private Long unitAmount;

            private BigDecimal unitAmountDecimal;

            /** Finalize and obtain parameter instance from this builder. */
            public InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.PriceData build() {
              return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.PriceData(
                  this.currency,
                  this.extraParams,
                  this.product,
                  this.recurring,
                  this.taxBehavior,
                  this.unitAmount,
                  this.unitAmountDecimal);
            }

            /**
             * Required. Three-letter ISO currency code, in
             * lowercase. Must be a supported
             * currency.
             */
            public Builder setCurrency(String currency) {
              this.currency = currency;
              return this;
            }

            /**
             * Add a key/value pair to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.PriceData#extraParams} for the
             * field documentation.
             */
            public Builder putExtraParam(String key, Object value) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.put(key, value);
              return this;
            }

            /**
             * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.PriceData#extraParams} for the
             * field documentation.
             */
            public Builder putAllExtraParam(Map map) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.putAll(map);
              return this;
            }

            /** Required. The ID of the product that this price will belong to. */
            public Builder setProduct(String product) {
              this.product = product;
              return this;
            }

            /**
             * Required. The recurring components of a price such as {@code
             * interval} and {@code interval_count}.
             */
            public Builder setRecurring(
                InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.PriceData.Recurring
                    recurring) {
              this.recurring = recurring;
              return this;
            }

            /**
             * Only required if a default
             * tax behavior was not provided in the Stripe Tax settings. Specifies whether the
             * price is considered inclusive of taxes or exclusive of taxes. One of {@code
             * inclusive}, {@code exclusive}, or {@code unspecified}. Once specified as either
             * {@code inclusive} or {@code exclusive}, it cannot be changed.
             */
            public Builder setTaxBehavior(
                InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.PriceData.TaxBehavior
                    taxBehavior) {
              this.taxBehavior = taxBehavior;
              return this;
            }

            /**
             * A positive integer in cents (or local equivalent) (or 0 for a free price)
             * representing how much to charge.
             */
            public Builder setUnitAmount(Long unitAmount) {
              this.unitAmount = unitAmount;
              return this;
            }

            /**
             * Same as {@code unit_amount}, but accepts a decimal value in cents (or local
             * equivalent) with at most 12 decimal places. Only one of {@code unit_amount} and
             * {@code unit_amount_decimal} can be set.
             */
            public Builder setUnitAmountDecimal(BigDecimal unitAmountDecimal) {
              this.unitAmountDecimal = unitAmountDecimal;
              return this;
            }
          }

          @Getter
          public static class Recurring {
            /**
             * Map of extra parameters for custom features not available in this client library. The
             * content in this map is not serialized under this field's {@code @SerializedName}
             * value. Instead, each key/value pair is serialized as if the key is a root-level field
             * (serialized) name in this param object. Effectively, this map is flattened to its
             * parent instance.
             */
            @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
            Map extraParams;

            /**
             * Required. Specifies billing frequency. Either {@code day}, {@code
             * week}, {@code month} or {@code year}.
             */
            @SerializedName("interval")
            Interval interval;

            /**
             * The number of intervals between subscription billings. For example, {@code
             * interval=month} and {@code interval_count=3} bills every 3 months. Maximum of three
             * years interval allowed (3 years, 36 months, or 156 weeks).
             */
            @SerializedName("interval_count")
            Long intervalCount;

            private Recurring(
                Map extraParams, Interval interval, Long intervalCount) {
              this.extraParams = extraParams;
              this.interval = interval;
              this.intervalCount = intervalCount;
            }

            public static Builder builder() {
              return new Builder();
            }

            public static class Builder {
              private Map extraParams;

              private Interval interval;

              private Long intervalCount;

              /** Finalize and obtain parameter instance from this builder. */
              public InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.PriceData.Recurring
                  build() {
                return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.PriceData
                    .Recurring(this.extraParams, this.interval, this.intervalCount);
              }

              /**
               * Add a key/value pair to `extraParams` map. A map is initialized for the first
               * `put/putAll` call, and subsequent calls add additional key/value pairs to the
               * original map. See {@link
               * InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.PriceData.Recurring#extraParams}
               * for the field documentation.
               */
              public Builder putExtraParam(String key, Object value) {
                if (this.extraParams == null) {
                  this.extraParams = new HashMap<>();
                }
                this.extraParams.put(key, value);
                return this;
              }

              /**
               * Add all map key/value pairs to `extraParams` map. A map is initialized for the
               * first `put/putAll` call, and subsequent calls add additional key/value pairs to the
               * original map. See {@link
               * InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.PriceData.Recurring#extraParams}
               * for the field documentation.
               */
              public Builder putAllExtraParam(Map map) {
                if (this.extraParams == null) {
                  this.extraParams = new HashMap<>();
                }
                this.extraParams.putAll(map);
                return this;
              }

              /**
               * Required. Specifies billing frequency. Either {@code day}, {@code
               * week}, {@code month} or {@code year}.
               */
              public Builder setInterval(
                  InvoiceCreatePreviewParams.ScheduleDetails.Phase.Item.PriceData.Recurring.Interval
                      interval) {
                this.interval = interval;
                return this;
              }

              /**
               * The number of intervals between subscription billings. For example, {@code
               * interval=month} and {@code interval_count=3} bills every 3 months. Maximum of three
               * years interval allowed (3 years, 36 months, or 156 weeks).
               */
              public Builder setIntervalCount(Long intervalCount) {
                this.intervalCount = intervalCount;
                return this;
              }
            }

            public enum Interval implements ApiRequestParams.EnumParam {
              @SerializedName("day")
              DAY("day"),

              @SerializedName("month")
              MONTH("month"),

              @SerializedName("week")
              WEEK("week"),

              @SerializedName("year")
              YEAR("year");

              @Getter(onMethod_ = {@Override})
              private final String value;

              Interval(String value) {
                this.value = value;
              }
            }
          }

          public enum TaxBehavior implements ApiRequestParams.EnumParam {
            @SerializedName("exclusive")
            EXCLUSIVE("exclusive"),

            @SerializedName("inclusive")
            INCLUSIVE("inclusive"),

            @SerializedName("unspecified")
            UNSPECIFIED("unspecified");

            @Getter(onMethod_ = {@Override})
            private final String value;

            TaxBehavior(String value) {
              this.value = value;
            }
          }
        }
      }

      @Getter
      public static class TransferData {
        /**
         * A non-negative decimal between 0 and 100, with at most two decimal places. This
         * represents the percentage of the subscription invoice total that will be transferred to
         * the destination account. By default, the entire amount is transferred to the destination.
         */
        @SerializedName("amount_percent")
        BigDecimal amountPercent;

        /** Required. ID of an existing, connected Stripe account. */
        @SerializedName("destination")
        String destination;

        /**
         * Map of extra parameters for custom features not available in this client library. The
         * content in this map is not serialized under this field's {@code @SerializedName} value.
         * Instead, each key/value pair is serialized as if the key is a root-level field
         * (serialized) name in this param object. Effectively, this map is flattened to its parent
         * instance.
         */
        @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
        Map extraParams;

        private TransferData(
            BigDecimal amountPercent, String destination, Map extraParams) {
          this.amountPercent = amountPercent;
          this.destination = destination;
          this.extraParams = extraParams;
        }

        public static Builder builder() {
          return new Builder();
        }

        public static class Builder {
          private BigDecimal amountPercent;

          private String destination;

          private Map extraParams;

          /** Finalize and obtain parameter instance from this builder. */
          public InvoiceCreatePreviewParams.ScheduleDetails.Phase.TransferData build() {
            return new InvoiceCreatePreviewParams.ScheduleDetails.Phase.TransferData(
                this.amountPercent, this.destination, this.extraParams);
          }

          /**
           * A non-negative decimal between 0 and 100, with at most two decimal places. This
           * represents the percentage of the subscription invoice total that will be transferred to
           * the destination account. By default, the entire amount is transferred to the
           * destination.
           */
          public Builder setAmountPercent(BigDecimal amountPercent) {
            this.amountPercent = amountPercent;
            return this;
          }

          /** Required. ID of an existing, connected Stripe account. */
          public Builder setDestination(String destination) {
            this.destination = destination;
            return this;
          }

          /**
           * Add a key/value pair to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.TransferData#extraParams} for the
           * field documentation.
           */
          public Builder putExtraParam(String key, Object value) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.put(key, value);
            return this;
          }

          /**
           * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.ScheduleDetails.Phase.TransferData#extraParams} for the
           * field documentation.
           */
          public Builder putAllExtraParam(Map map) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.putAll(map);
            return this;
          }
        }
      }

      public enum BillingCycleAnchor implements ApiRequestParams.EnumParam {
        @SerializedName("automatic")
        AUTOMATIC("automatic"),

        @SerializedName("phase_start")
        PHASE_START("phase_start");

        @Getter(onMethod_ = {@Override})
        private final String value;

        BillingCycleAnchor(String value) {
          this.value = value;
        }
      }

      public enum CollectionMethod implements ApiRequestParams.EnumParam {
        @SerializedName("charge_automatically")
        CHARGE_AUTOMATICALLY("charge_automatically"),

        @SerializedName("send_invoice")
        SEND_INVOICE("send_invoice");

        @Getter(onMethod_ = {@Override})
        private final String value;

        CollectionMethod(String value) {
          this.value = value;
        }
      }

      public enum EndDate implements ApiRequestParams.EnumParam {
        @SerializedName("now")
        NOW("now");

        @Getter(onMethod_ = {@Override})
        private final String value;

        EndDate(String value) {
          this.value = value;
        }
      }

      public enum ProrationBehavior implements ApiRequestParams.EnumParam {
        @SerializedName("always_invoice")
        ALWAYS_INVOICE("always_invoice"),

        @SerializedName("create_prorations")
        CREATE_PRORATIONS("create_prorations"),

        @SerializedName("none")
        NONE("none");

        @Getter(onMethod_ = {@Override})
        private final String value;

        ProrationBehavior(String value) {
          this.value = value;
        }
      }

      public enum StartDate implements ApiRequestParams.EnumParam {
        @SerializedName("now")
        NOW("now");

        @Getter(onMethod_ = {@Override})
        private final String value;

        StartDate(String value) {
          this.value = value;
        }
      }

      public enum TrialEnd implements ApiRequestParams.EnumParam {
        @SerializedName("now")
        NOW("now");

        @Getter(onMethod_ = {@Override})
        private final String value;

        TrialEnd(String value) {
          this.value = value;
        }
      }
    }

    public enum EndBehavior implements ApiRequestParams.EnumParam {
      @SerializedName("cancel")
      CANCEL("cancel"),

      @SerializedName("release")
      RELEASE("release");

      @Getter(onMethod_ = {@Override})
      private final String value;

      EndBehavior(String value) {
        this.value = value;
      }
    }

    public enum ProrationBehavior implements ApiRequestParams.EnumParam {
      @SerializedName("always_invoice")
      ALWAYS_INVOICE("always_invoice"),

      @SerializedName("create_prorations")
      CREATE_PRORATIONS("create_prorations"),

      @SerializedName("none")
      NONE("none");

      @Getter(onMethod_ = {@Override})
      private final String value;

      ProrationBehavior(String value) {
        this.value = value;
      }
    }
  }

  @Getter
  public static class SubscriptionDetails {
    /**
     * For new subscriptions, a future timestamp to anchor the subscription's billing cycle. This is used to
     * determine the date of the first full invoice, and, for plans with {@code month} or {@code
     * year} intervals, the day of the month for subsequent invoices. For existing subscriptions,
     * the value can only be set to {@code now} or {@code unchanged}.
     */
    @SerializedName("billing_cycle_anchor")
    Object billingCycleAnchor;

    /**
     * A timestamp at which the subscription should cancel. If set to a date before the current
     * period ends, this will cause a proration if prorations have been enabled using {@code
     * proration_behavior}. If set during a future period, this will always cause a proration for
     * that period.
     */
    @SerializedName("cancel_at")
    Object cancelAt;

    /**
     * Indicate whether this subscription should cancel at the end of the current period ({@code
     * current_period_end}). Defaults to {@code false}.
     */
    @SerializedName("cancel_at_period_end")
    Boolean cancelAtPeriodEnd;

    /** This simulates the subscription being canceled or expired immediately. */
    @SerializedName("cancel_now")
    Boolean cancelNow;

    /**
     * If provided, the invoice returned will preview updating or creating a subscription with these
     * default tax rates. The default tax rates will apply to any line item that does not have
     * {@code tax_rates} set.
     */
    @SerializedName("default_tax_rates")
    Object defaultTaxRates;

    /**
     * Map of extra parameters for custom features not available in this client library. The content
     * in this map is not serialized under this field's {@code @SerializedName} value. Instead, each
     * key/value pair is serialized as if the key is a root-level field (serialized) name in this
     * param object. Effectively, this map is flattened to its parent instance.
     */
    @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
    Map extraParams;

    /** A list of up to 20 subscription items, each with an attached price. */
    @SerializedName("items")
    List items;

    /**
     * Determines how to handle prorations when the
     * billing cycle changes (e.g., when switching plans, resetting {@code
     * billing_cycle_anchor=now}, or starting a trial), or if an item's {@code quantity} changes.
     * The default value is {@code create_prorations}.
     */
    @SerializedName("proration_behavior")
    ProrationBehavior prorationBehavior;

    /**
     * If previewing an update to a subscription, and doing proration, {@code
     * subscription_details.proration_date} forces the proration to be calculated as though the
     * update was done at the specified time. The time given must be within the current subscription
     * period and within the current phase of the schedule backing this subscription, if the
     * schedule exists. If set, {@code subscription}, and one of {@code subscription_details.items},
     * or {@code subscription_details.trial_end} are required. Also, {@code
     * subscription_details.proration_behavior} cannot be set to 'none'.
     */
    @SerializedName("proration_date")
    Long prorationDate;

    /**
     * For paused subscriptions, setting {@code subscription_details.resume_at} to {@code now} will
     * preview the invoice that will be generated if the subscription is resumed.
     */
    @SerializedName("resume_at")
    ResumeAt resumeAt;

    /** Date a subscription is intended to start (can be future or past). */
    @SerializedName("start_date")
    Long startDate;

    /**
     * If provided, the invoice returned will preview updating or creating a subscription with that
     * trial end. If set, one of {@code subscription_details.items} or {@code subscription} is
     * required.
     */
    @SerializedName("trial_end")
    Object trialEnd;

    private SubscriptionDetails(
        Object billingCycleAnchor,
        Object cancelAt,
        Boolean cancelAtPeriodEnd,
        Boolean cancelNow,
        Object defaultTaxRates,
        Map extraParams,
        List items,
        ProrationBehavior prorationBehavior,
        Long prorationDate,
        ResumeAt resumeAt,
        Long startDate,
        Object trialEnd) {
      this.billingCycleAnchor = billingCycleAnchor;
      this.cancelAt = cancelAt;
      this.cancelAtPeriodEnd = cancelAtPeriodEnd;
      this.cancelNow = cancelNow;
      this.defaultTaxRates = defaultTaxRates;
      this.extraParams = extraParams;
      this.items = items;
      this.prorationBehavior = prorationBehavior;
      this.prorationDate = prorationDate;
      this.resumeAt = resumeAt;
      this.startDate = startDate;
      this.trialEnd = trialEnd;
    }

    public static Builder builder() {
      return new Builder();
    }

    public static class Builder {
      private Object billingCycleAnchor;

      private Object cancelAt;

      private Boolean cancelAtPeriodEnd;

      private Boolean cancelNow;

      private Object defaultTaxRates;

      private Map extraParams;

      private List items;

      private ProrationBehavior prorationBehavior;

      private Long prorationDate;

      private ResumeAt resumeAt;

      private Long startDate;

      private Object trialEnd;

      /** Finalize and obtain parameter instance from this builder. */
      public InvoiceCreatePreviewParams.SubscriptionDetails build() {
        return new InvoiceCreatePreviewParams.SubscriptionDetails(
            this.billingCycleAnchor,
            this.cancelAt,
            this.cancelAtPeriodEnd,
            this.cancelNow,
            this.defaultTaxRates,
            this.extraParams,
            this.items,
            this.prorationBehavior,
            this.prorationDate,
            this.resumeAt,
            this.startDate,
            this.trialEnd);
      }

      /**
       * For new subscriptions, a future timestamp to anchor the subscription's billing cycle. This is used
       * to determine the date of the first full invoice, and, for plans with {@code month} or
       * {@code year} intervals, the day of the month for subsequent invoices. For existing
       * subscriptions, the value can only be set to {@code now} or {@code unchanged}.
       */
      public Builder setBillingCycleAnchor(
          InvoiceCreatePreviewParams.SubscriptionDetails.BillingCycleAnchor billingCycleAnchor) {
        this.billingCycleAnchor = billingCycleAnchor;
        return this;
      }

      /**
       * For new subscriptions, a future timestamp to anchor the subscription's billing cycle. This is used
       * to determine the date of the first full invoice, and, for plans with {@code month} or
       * {@code year} intervals, the day of the month for subsequent invoices. For existing
       * subscriptions, the value can only be set to {@code now} or {@code unchanged}.
       */
      public Builder setBillingCycleAnchor(Long billingCycleAnchor) {
        this.billingCycleAnchor = billingCycleAnchor;
        return this;
      }

      /**
       * A timestamp at which the subscription should cancel. If set to a date before the current
       * period ends, this will cause a proration if prorations have been enabled using {@code
       * proration_behavior}. If set during a future period, this will always cause a proration for
       * that period.
       */
      public Builder setCancelAt(Long cancelAt) {
        this.cancelAt = cancelAt;
        return this;
      }

      /**
       * A timestamp at which the subscription should cancel. If set to a date before the current
       * period ends, this will cause a proration if prorations have been enabled using {@code
       * proration_behavior}. If set during a future period, this will always cause a proration for
       * that period.
       */
      public Builder setCancelAt(EmptyParam cancelAt) {
        this.cancelAt = cancelAt;
        return this;
      }

      /**
       * Indicate whether this subscription should cancel at the end of the current period ({@code
       * current_period_end}). Defaults to {@code false}.
       */
      public Builder setCancelAtPeriodEnd(Boolean cancelAtPeriodEnd) {
        this.cancelAtPeriodEnd = cancelAtPeriodEnd;
        return this;
      }

      /** This simulates the subscription being canceled or expired immediately. */
      public Builder setCancelNow(Boolean cancelNow) {
        this.cancelNow = cancelNow;
        return this;
      }

      /**
       * Add an element to `defaultTaxRates` list. A list is initialized for the first `add/addAll`
       * call, and subsequent calls adds additional elements to the original list. See {@link
       * InvoiceCreatePreviewParams.SubscriptionDetails#defaultTaxRates} for the field
       * documentation.
       */
      @SuppressWarnings("unchecked")
      public Builder addDefaultTaxRate(String element) {
        if (this.defaultTaxRates == null || this.defaultTaxRates instanceof EmptyParam) {
          this.defaultTaxRates = new ArrayList();
        }
        ((List) this.defaultTaxRates).add(element);
        return this;
      }

      /**
       * Add all elements to `defaultTaxRates` list. A list is initialized for the first
       * `add/addAll` call, and subsequent calls adds additional elements to the original list. See
       * {@link InvoiceCreatePreviewParams.SubscriptionDetails#defaultTaxRates} for the field
       * documentation.
       */
      @SuppressWarnings("unchecked")
      public Builder addAllDefaultTaxRate(List elements) {
        if (this.defaultTaxRates == null || this.defaultTaxRates instanceof EmptyParam) {
          this.defaultTaxRates = new ArrayList();
        }
        ((List) this.defaultTaxRates).addAll(elements);
        return this;
      }

      /**
       * If provided, the invoice returned will preview updating or creating a subscription with
       * these default tax rates. The default tax rates will apply to any line item that does not
       * have {@code tax_rates} set.
       */
      public Builder setDefaultTaxRates(EmptyParam defaultTaxRates) {
        this.defaultTaxRates = defaultTaxRates;
        return this;
      }

      /**
       * If provided, the invoice returned will preview updating or creating a subscription with
       * these default tax rates. The default tax rates will apply to any line item that does not
       * have {@code tax_rates} set.
       */
      public Builder setDefaultTaxRates(List defaultTaxRates) {
        this.defaultTaxRates = defaultTaxRates;
        return this;
      }

      /**
       * Add a key/value pair to `extraParams` map. A map is initialized for the first `put/putAll`
       * call, and subsequent calls add additional key/value pairs to the original map. See {@link
       * InvoiceCreatePreviewParams.SubscriptionDetails#extraParams} for the field documentation.
       */
      public Builder putExtraParam(String key, Object value) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.put(key, value);
        return this;
      }

      /**
       * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
       * `put/putAll` call, and subsequent calls add additional key/value pairs to the original map.
       * See {@link InvoiceCreatePreviewParams.SubscriptionDetails#extraParams} for the field
       * documentation.
       */
      public Builder putAllExtraParam(Map map) {
        if (this.extraParams == null) {
          this.extraParams = new HashMap<>();
        }
        this.extraParams.putAll(map);
        return this;
      }

      /**
       * Add an element to `items` list. A list is initialized for the first `add/addAll` call, and
       * subsequent calls adds additional elements to the original list. See {@link
       * InvoiceCreatePreviewParams.SubscriptionDetails#items} for the field documentation.
       */
      public Builder addItem(InvoiceCreatePreviewParams.SubscriptionDetails.Item element) {
        if (this.items == null) {
          this.items = new ArrayList<>();
        }
        this.items.add(element);
        return this;
      }

      /**
       * Add all elements to `items` list. A list is initialized for the first `add/addAll` call,
       * and subsequent calls adds additional elements to the original list. See {@link
       * InvoiceCreatePreviewParams.SubscriptionDetails#items} for the field documentation.
       */
      public Builder addAllItem(
          List elements) {
        if (this.items == null) {
          this.items = new ArrayList<>();
        }
        this.items.addAll(elements);
        return this;
      }

      /**
       * Determines how to handle prorations when the
       * billing cycle changes (e.g., when switching plans, resetting {@code
       * billing_cycle_anchor=now}, or starting a trial), or if an item's {@code quantity} changes.
       * The default value is {@code create_prorations}.
       */
      public Builder setProrationBehavior(
          InvoiceCreatePreviewParams.SubscriptionDetails.ProrationBehavior prorationBehavior) {
        this.prorationBehavior = prorationBehavior;
        return this;
      }

      /**
       * If previewing an update to a subscription, and doing proration, {@code
       * subscription_details.proration_date} forces the proration to be calculated as though the
       * update was done at the specified time. The time given must be within the current
       * subscription period and within the current phase of the schedule backing this subscription,
       * if the schedule exists. If set, {@code subscription}, and one of {@code
       * subscription_details.items}, or {@code subscription_details.trial_end} are required. Also,
       * {@code subscription_details.proration_behavior} cannot be set to 'none'.
       */
      public Builder setProrationDate(Long prorationDate) {
        this.prorationDate = prorationDate;
        return this;
      }

      /**
       * For paused subscriptions, setting {@code subscription_details.resume_at} to {@code now}
       * will preview the invoice that will be generated if the subscription is resumed.
       */
      public Builder setResumeAt(InvoiceCreatePreviewParams.SubscriptionDetails.ResumeAt resumeAt) {
        this.resumeAt = resumeAt;
        return this;
      }

      /** Date a subscription is intended to start (can be future or past). */
      public Builder setStartDate(Long startDate) {
        this.startDate = startDate;
        return this;
      }

      /**
       * If provided, the invoice returned will preview updating or creating a subscription with
       * that trial end. If set, one of {@code subscription_details.items} or {@code subscription}
       * is required.
       */
      public Builder setTrialEnd(InvoiceCreatePreviewParams.SubscriptionDetails.TrialEnd trialEnd) {
        this.trialEnd = trialEnd;
        return this;
      }

      /**
       * If provided, the invoice returned will preview updating or creating a subscription with
       * that trial end. If set, one of {@code subscription_details.items} or {@code subscription}
       * is required.
       */
      public Builder setTrialEnd(Long trialEnd) {
        this.trialEnd = trialEnd;
        return this;
      }
    }

    @Getter
    public static class Item {
      /**
       * Define thresholds at which an invoice will be sent, and the subscription advanced to a new
       * billing period. When updating, pass an empty string to remove previously-defined
       * thresholds.
       */
      @SerializedName("billing_thresholds")
      Object billingThresholds;

      /**
       * Delete all usage for a given subscription item. Allowed only when {@code deleted} is set to
       * {@code true} and the current plan's {@code usage_type} is {@code metered}.
       */
      @SerializedName("clear_usage")
      Boolean clearUsage;

      /** A flag that, if set to {@code true}, will delete the specified item. */
      @SerializedName("deleted")
      Boolean deleted;

      /** The coupons to redeem into discounts for the subscription item. */
      @SerializedName("discounts")
      Object discounts;

      /**
       * Map of extra parameters for custom features not available in this client library. The
       * content in this map is not serialized under this field's {@code @SerializedName} value.
       * Instead, each key/value pair is serialized as if the key is a root-level field (serialized)
       * name in this param object. Effectively, this map is flattened to its parent instance.
       */
      @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
      Map extraParams;

      /** Subscription item to update. */
      @SerializedName("id")
      String id;

      /**
       * Set of key-value pairs that you can
       * attach to an object. This can be useful for storing additional information about the object
       * in a structured format. Individual keys can be unset by posting an empty value to them. All
       * keys can be unset by posting an empty value to {@code metadata}.
       */
      @SerializedName("metadata")
      Object metadata;

      /** Plan ID for this item, as a string. */
      @SerializedName("plan")
      String plan;

      /**
       * The ID of the price object. One of {@code price} or {@code price_data} is required. When
       * changing a subscription item's price, {@code quantity} is set to 1 unless a {@code
       * quantity} parameter is provided.
       */
      @SerializedName("price")
      String price;

      /**
       * Data used to generate a new Price object
       * inline. One of {@code price} or {@code price_data} is required.
       */
      @SerializedName("price_data")
      PriceData priceData;

      /** Quantity for this item. */
      @SerializedName("quantity")
      Long quantity;

      /**
       * A list of Tax Rate ids. These Tax Rates
       * will override the {@code
       * default_tax_rates} on the Subscription. When updating, pass an empty string to remove
       * previously-defined tax rates.
       */
      @SerializedName("tax_rates")
      Object taxRates;

      private Item(
          Object billingThresholds,
          Boolean clearUsage,
          Boolean deleted,
          Object discounts,
          Map extraParams,
          String id,
          Object metadata,
          String plan,
          String price,
          PriceData priceData,
          Long quantity,
          Object taxRates) {
        this.billingThresholds = billingThresholds;
        this.clearUsage = clearUsage;
        this.deleted = deleted;
        this.discounts = discounts;
        this.extraParams = extraParams;
        this.id = id;
        this.metadata = metadata;
        this.plan = plan;
        this.price = price;
        this.priceData = priceData;
        this.quantity = quantity;
        this.taxRates = taxRates;
      }

      public static Builder builder() {
        return new Builder();
      }

      public static class Builder {
        private Object billingThresholds;

        private Boolean clearUsage;

        private Boolean deleted;

        private Object discounts;

        private Map extraParams;

        private String id;

        private Object metadata;

        private String plan;

        private String price;

        private PriceData priceData;

        private Long quantity;

        private Object taxRates;

        /** Finalize and obtain parameter instance from this builder. */
        public InvoiceCreatePreviewParams.SubscriptionDetails.Item build() {
          return new InvoiceCreatePreviewParams.SubscriptionDetails.Item(
              this.billingThresholds,
              this.clearUsage,
              this.deleted,
              this.discounts,
              this.extraParams,
              this.id,
              this.metadata,
              this.plan,
              this.price,
              this.priceData,
              this.quantity,
              this.taxRates);
        }

        /**
         * Define thresholds at which an invoice will be sent, and the subscription advanced to a
         * new billing period. When updating, pass an empty string to remove previously-defined
         * thresholds.
         */
        public Builder setBillingThresholds(
            InvoiceCreatePreviewParams.SubscriptionDetails.Item.BillingThresholds
                billingThresholds) {
          this.billingThresholds = billingThresholds;
          return this;
        }

        /**
         * Define thresholds at which an invoice will be sent, and the subscription advanced to a
         * new billing period. When updating, pass an empty string to remove previously-defined
         * thresholds.
         */
        public Builder setBillingThresholds(EmptyParam billingThresholds) {
          this.billingThresholds = billingThresholds;
          return this;
        }

        /**
         * Delete all usage for a given subscription item. Allowed only when {@code deleted} is set
         * to {@code true} and the current plan's {@code usage_type} is {@code metered}.
         */
        public Builder setClearUsage(Boolean clearUsage) {
          this.clearUsage = clearUsage;
          return this;
        }

        /** A flag that, if set to {@code true}, will delete the specified item. */
        public Builder setDeleted(Boolean deleted) {
          this.deleted = deleted;
          return this;
        }

        /**
         * Add an element to `discounts` list. A list is initialized for the first `add/addAll`
         * call, and subsequent calls adds additional elements to the original list. See {@link
         * InvoiceCreatePreviewParams.SubscriptionDetails.Item#discounts} for the field
         * documentation.
         */
        @SuppressWarnings("unchecked")
        public Builder addDiscount(
            InvoiceCreatePreviewParams.SubscriptionDetails.Item.Discount element) {
          if (this.discounts == null || this.discounts instanceof EmptyParam) {
            this.discounts =
                new ArrayList();
          }
          ((List) this.discounts)
              .add(element);
          return this;
        }

        /**
         * Add all elements to `discounts` list. A list is initialized for the first `add/addAll`
         * call, and subsequent calls adds additional elements to the original list. See {@link
         * InvoiceCreatePreviewParams.SubscriptionDetails.Item#discounts} for the field
         * documentation.
         */
        @SuppressWarnings("unchecked")
        public Builder addAllDiscount(
            List elements) {
          if (this.discounts == null || this.discounts instanceof EmptyParam) {
            this.discounts =
                new ArrayList();
          }
          ((List) this.discounts)
              .addAll(elements);
          return this;
        }

        /** The coupons to redeem into discounts for the subscription item. */
        public Builder setDiscounts(EmptyParam discounts) {
          this.discounts = discounts;
          return this;
        }

        /** The coupons to redeem into discounts for the subscription item. */
        public Builder setDiscounts(
            List discounts) {
          this.discounts = discounts;
          return this;
        }

        /**
         * Add a key/value pair to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.SubscriptionDetails.Item#extraParams} for the
         * field documentation.
         */
        public Builder putExtraParam(String key, Object value) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.put(key, value);
          return this;
        }

        /**
         * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.SubscriptionDetails.Item#extraParams} for the
         * field documentation.
         */
        public Builder putAllExtraParam(Map map) {
          if (this.extraParams == null) {
            this.extraParams = new HashMap<>();
          }
          this.extraParams.putAll(map);
          return this;
        }

        /** Subscription item to update. */
        public Builder setId(String id) {
          this.id = id;
          return this;
        }

        /**
         * Add a key/value pair to `metadata` map. A map is initialized for the first `put/putAll`
         * call, and subsequent calls add additional key/value pairs to the original map. See {@link
         * InvoiceCreatePreviewParams.SubscriptionDetails.Item#metadata} for the field
         * documentation.
         */
        @SuppressWarnings("unchecked")
        public Builder putMetadata(String key, String value) {
          if (this.metadata == null || this.metadata instanceof EmptyParam) {
            this.metadata = new HashMap();
          }
          ((Map) this.metadata).put(key, value);
          return this;
        }

        /**
         * Add all map key/value pairs to `metadata` map. A map is initialized for the first
         * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
         * map. See {@link InvoiceCreatePreviewParams.SubscriptionDetails.Item#metadata} for the
         * field documentation.
         */
        @SuppressWarnings("unchecked")
        public Builder putAllMetadata(Map map) {
          if (this.metadata == null || this.metadata instanceof EmptyParam) {
            this.metadata = new HashMap();
          }
          ((Map) this.metadata).putAll(map);
          return this;
        }

        /**
         * Set of key-value pairs that you can
         * attach to an object. This can be useful for storing additional information about the
         * object in a structured format. Individual keys can be unset by posting an empty value to
         * them. All keys can be unset by posting an empty value to {@code metadata}.
         */
        public Builder setMetadata(EmptyParam metadata) {
          this.metadata = metadata;
          return this;
        }

        /**
         * Set of key-value pairs that you can
         * attach to an object. This can be useful for storing additional information about the
         * object in a structured format. Individual keys can be unset by posting an empty value to
         * them. All keys can be unset by posting an empty value to {@code metadata}.
         */
        public Builder setMetadata(Map metadata) {
          this.metadata = metadata;
          return this;
        }

        /** Plan ID for this item, as a string. */
        public Builder setPlan(String plan) {
          this.plan = plan;
          return this;
        }

        /**
         * The ID of the price object. One of {@code price} or {@code price_data} is required. When
         * changing a subscription item's price, {@code quantity} is set to 1 unless a {@code
         * quantity} parameter is provided.
         */
        public Builder setPrice(String price) {
          this.price = price;
          return this;
        }

        /**
         * Data used to generate a new Price object
         * inline. One of {@code price} or {@code price_data} is required.
         */
        public Builder setPriceData(
            InvoiceCreatePreviewParams.SubscriptionDetails.Item.PriceData priceData) {
          this.priceData = priceData;
          return this;
        }

        /** Quantity for this item. */
        public Builder setQuantity(Long quantity) {
          this.quantity = quantity;
          return this;
        }

        /**
         * Add an element to `taxRates` list. A list is initialized for the first `add/addAll` call,
         * and subsequent calls adds additional elements to the original list. See {@link
         * InvoiceCreatePreviewParams.SubscriptionDetails.Item#taxRates} for the field
         * documentation.
         */
        @SuppressWarnings("unchecked")
        public Builder addTaxRate(String element) {
          if (this.taxRates == null || this.taxRates instanceof EmptyParam) {
            this.taxRates = new ArrayList();
          }
          ((List) this.taxRates).add(element);
          return this;
        }

        /**
         * Add all elements to `taxRates` list. A list is initialized for the first `add/addAll`
         * call, and subsequent calls adds additional elements to the original list. See {@link
         * InvoiceCreatePreviewParams.SubscriptionDetails.Item#taxRates} for the field
         * documentation.
         */
        @SuppressWarnings("unchecked")
        public Builder addAllTaxRate(List elements) {
          if (this.taxRates == null || this.taxRates instanceof EmptyParam) {
            this.taxRates = new ArrayList();
          }
          ((List) this.taxRates).addAll(elements);
          return this;
        }

        /**
         * A list of Tax Rate ids. These Tax
         * Rates will override the {@code
         * default_tax_rates} on the Subscription. When updating, pass an empty string to remove
         * previously-defined tax rates.
         */
        public Builder setTaxRates(EmptyParam taxRates) {
          this.taxRates = taxRates;
          return this;
        }

        /**
         * A list of Tax Rate ids. These Tax
         * Rates will override the {@code
         * default_tax_rates} on the Subscription. When updating, pass an empty string to remove
         * previously-defined tax rates.
         */
        public Builder setTaxRates(List taxRates) {
          this.taxRates = taxRates;
          return this;
        }
      }

      @Getter
      public static class BillingThresholds {
        /**
         * Map of extra parameters for custom features not available in this client library. The
         * content in this map is not serialized under this field's {@code @SerializedName} value.
         * Instead, each key/value pair is serialized as if the key is a root-level field
         * (serialized) name in this param object. Effectively, this map is flattened to its parent
         * instance.
         */
        @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
        Map extraParams;

        /**
         * Required. Number of units that meets the billing threshold to advance
         * the subscription to a new billing period (e.g., it takes 10 $5 units to meet a $50 monetary
         * threshold)
         */
        @SerializedName("usage_gte")
        Long usageGte;

        private BillingThresholds(Map extraParams, Long usageGte) {
          this.extraParams = extraParams;
          this.usageGte = usageGte;
        }

        public static Builder builder() {
          return new Builder();
        }

        public static class Builder {
          private Map extraParams;

          private Long usageGte;

          /** Finalize and obtain parameter instance from this builder. */
          public InvoiceCreatePreviewParams.SubscriptionDetails.Item.BillingThresholds build() {
            return new InvoiceCreatePreviewParams.SubscriptionDetails.Item.BillingThresholds(
                this.extraParams, this.usageGte);
          }

          /**
           * Add a key/value pair to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.SubscriptionDetails.Item.BillingThresholds#extraParams} for
           * the field documentation.
           */
          public Builder putExtraParam(String key, Object value) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.put(key, value);
            return this;
          }

          /**
           * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.SubscriptionDetails.Item.BillingThresholds#extraParams} for
           * the field documentation.
           */
          public Builder putAllExtraParam(Map map) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.putAll(map);
            return this;
          }

          /**
           * Required. Number of units that meets the billing threshold to advance
           * the subscription to a new billing period (e.g., it takes 10 $5 units to meet a $50 monetary
           * threshold)
           */
          public Builder setUsageGte(Long usageGte) {
            this.usageGte = usageGte;
            return this;
          }
        }
      }

      @Getter
      public static class Discount {
        /** ID of the coupon to create a new discount for. */
        @SerializedName("coupon")
        String coupon;

        /** ID of an existing discount on the object (or one of its ancestors) to reuse. */
        @SerializedName("discount")
        String discount;

        /**
         * Map of extra parameters for custom features not available in this client library. The
         * content in this map is not serialized under this field's {@code @SerializedName} value.
         * Instead, each key/value pair is serialized as if the key is a root-level field
         * (serialized) name in this param object. Effectively, this map is flattened to its parent
         * instance.
         */
        @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
        Map extraParams;

        /** ID of the promotion code to create a new discount for. */
        @SerializedName("promotion_code")
        String promotionCode;

        private Discount(
            String coupon, String discount, Map extraParams, String promotionCode) {
          this.coupon = coupon;
          this.discount = discount;
          this.extraParams = extraParams;
          this.promotionCode = promotionCode;
        }

        public static Builder builder() {
          return new Builder();
        }

        public static class Builder {
          private String coupon;

          private String discount;

          private Map extraParams;

          private String promotionCode;

          /** Finalize and obtain parameter instance from this builder. */
          public InvoiceCreatePreviewParams.SubscriptionDetails.Item.Discount build() {
            return new InvoiceCreatePreviewParams.SubscriptionDetails.Item.Discount(
                this.coupon, this.discount, this.extraParams, this.promotionCode);
          }

          /** ID of the coupon to create a new discount for. */
          public Builder setCoupon(String coupon) {
            this.coupon = coupon;
            return this;
          }

          /** ID of an existing discount on the object (or one of its ancestors) to reuse. */
          public Builder setDiscount(String discount) {
            this.discount = discount;
            return this;
          }

          /**
           * Add a key/value pair to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.SubscriptionDetails.Item.Discount#extraParams} for the field
           * documentation.
           */
          public Builder putExtraParam(String key, Object value) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.put(key, value);
            return this;
          }

          /**
           * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.SubscriptionDetails.Item.Discount#extraParams} for the field
           * documentation.
           */
          public Builder putAllExtraParam(Map map) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.putAll(map);
            return this;
          }

          /** ID of the promotion code to create a new discount for. */
          public Builder setPromotionCode(String promotionCode) {
            this.promotionCode = promotionCode;
            return this;
          }
        }
      }

      @Getter
      public static class PriceData {
        /**
         * Required. Three-letter ISO currency code, in
         * lowercase. Must be a supported currency.
         */
        @SerializedName("currency")
        String currency;

        /**
         * Map of extra parameters for custom features not available in this client library. The
         * content in this map is not serialized under this field's {@code @SerializedName} value.
         * Instead, each key/value pair is serialized as if the key is a root-level field
         * (serialized) name in this param object. Effectively, this map is flattened to its parent
         * instance.
         */
        @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
        Map extraParams;

        /** Required. The ID of the product that this price will belong to. */
        @SerializedName("product")
        String product;

        /**
         * Required. The recurring components of a price such as {@code interval}
         * and {@code interval_count}.
         */
        @SerializedName("recurring")
        Recurring recurring;

        /**
         * Only required if a default
         * tax behavior was not provided in the Stripe Tax settings. Specifies whether the price
         * is considered inclusive of taxes or exclusive of taxes. One of {@code inclusive}, {@code
         * exclusive}, or {@code unspecified}. Once specified as either {@code inclusive} or {@code
         * exclusive}, it cannot be changed.
         */
        @SerializedName("tax_behavior")
        TaxBehavior taxBehavior;

        /**
         * A positive integer in cents (or local equivalent) (or 0 for a free price) representing
         * how much to charge.
         */
        @SerializedName("unit_amount")
        Long unitAmount;

        /**
         * Same as {@code unit_amount}, but accepts a decimal value in cents (or local equivalent)
         * with at most 12 decimal places. Only one of {@code unit_amount} and {@code
         * unit_amount_decimal} can be set.
         */
        @SerializedName("unit_amount_decimal")
        BigDecimal unitAmountDecimal;

        private PriceData(
            String currency,
            Map extraParams,
            String product,
            Recurring recurring,
            TaxBehavior taxBehavior,
            Long unitAmount,
            BigDecimal unitAmountDecimal) {
          this.currency = currency;
          this.extraParams = extraParams;
          this.product = product;
          this.recurring = recurring;
          this.taxBehavior = taxBehavior;
          this.unitAmount = unitAmount;
          this.unitAmountDecimal = unitAmountDecimal;
        }

        public static Builder builder() {
          return new Builder();
        }

        public static class Builder {
          private String currency;

          private Map extraParams;

          private String product;

          private Recurring recurring;

          private TaxBehavior taxBehavior;

          private Long unitAmount;

          private BigDecimal unitAmountDecimal;

          /** Finalize and obtain parameter instance from this builder. */
          public InvoiceCreatePreviewParams.SubscriptionDetails.Item.PriceData build() {
            return new InvoiceCreatePreviewParams.SubscriptionDetails.Item.PriceData(
                this.currency,
                this.extraParams,
                this.product,
                this.recurring,
                this.taxBehavior,
                this.unitAmount,
                this.unitAmountDecimal);
          }

          /**
           * Required. Three-letter ISO currency code, in
           * lowercase. Must be a supported
           * currency.
           */
          public Builder setCurrency(String currency) {
            this.currency = currency;
            return this;
          }

          /**
           * Add a key/value pair to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.SubscriptionDetails.Item.PriceData#extraParams} for the
           * field documentation.
           */
          public Builder putExtraParam(String key, Object value) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.put(key, value);
            return this;
          }

          /**
           * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
           * `put/putAll` call, and subsequent calls add additional key/value pairs to the original
           * map. See {@link
           * InvoiceCreatePreviewParams.SubscriptionDetails.Item.PriceData#extraParams} for the
           * field documentation.
           */
          public Builder putAllExtraParam(Map map) {
            if (this.extraParams == null) {
              this.extraParams = new HashMap<>();
            }
            this.extraParams.putAll(map);
            return this;
          }

          /** Required. The ID of the product that this price will belong to. */
          public Builder setProduct(String product) {
            this.product = product;
            return this;
          }

          /**
           * Required. The recurring components of a price such as {@code interval}
           * and {@code interval_count}.
           */
          public Builder setRecurring(
              InvoiceCreatePreviewParams.SubscriptionDetails.Item.PriceData.Recurring recurring) {
            this.recurring = recurring;
            return this;
          }

          /**
           * Only required if a default
           * tax behavior was not provided in the Stripe Tax settings. Specifies whether the
           * price is considered inclusive of taxes or exclusive of taxes. One of {@code inclusive},
           * {@code exclusive}, or {@code unspecified}. Once specified as either {@code inclusive}
           * or {@code exclusive}, it cannot be changed.
           */
          public Builder setTaxBehavior(
              InvoiceCreatePreviewParams.SubscriptionDetails.Item.PriceData.TaxBehavior
                  taxBehavior) {
            this.taxBehavior = taxBehavior;
            return this;
          }

          /**
           * A positive integer in cents (or local equivalent) (or 0 for a free price) representing
           * how much to charge.
           */
          public Builder setUnitAmount(Long unitAmount) {
            this.unitAmount = unitAmount;
            return this;
          }

          /**
           * Same as {@code unit_amount}, but accepts a decimal value in cents (or local equivalent)
           * with at most 12 decimal places. Only one of {@code unit_amount} and {@code
           * unit_amount_decimal} can be set.
           */
          public Builder setUnitAmountDecimal(BigDecimal unitAmountDecimal) {
            this.unitAmountDecimal = unitAmountDecimal;
            return this;
          }
        }

        @Getter
        public static class Recurring {
          /**
           * Map of extra parameters for custom features not available in this client library. The
           * content in this map is not serialized under this field's {@code @SerializedName} value.
           * Instead, each key/value pair is serialized as if the key is a root-level field
           * (serialized) name in this param object. Effectively, this map is flattened to its
           * parent instance.
           */
          @SerializedName(ApiRequestParams.EXTRA_PARAMS_KEY)
          Map extraParams;

          /**
           * Required. Specifies billing frequency. Either {@code day}, {@code
           * week}, {@code month} or {@code year}.
           */
          @SerializedName("interval")
          Interval interval;

          /**
           * The number of intervals between subscription billings. For example, {@code
           * interval=month} and {@code interval_count=3} bills every 3 months. Maximum of three
           * years interval allowed (3 years, 36 months, or 156 weeks).
           */
          @SerializedName("interval_count")
          Long intervalCount;

          private Recurring(
              Map extraParams, Interval interval, Long intervalCount) {
            this.extraParams = extraParams;
            this.interval = interval;
            this.intervalCount = intervalCount;
          }

          public static Builder builder() {
            return new Builder();
          }

          public static class Builder {
            private Map extraParams;

            private Interval interval;

            private Long intervalCount;

            /** Finalize and obtain parameter instance from this builder. */
            public InvoiceCreatePreviewParams.SubscriptionDetails.Item.PriceData.Recurring build() {
              return new InvoiceCreatePreviewParams.SubscriptionDetails.Item.PriceData.Recurring(
                  this.extraParams, this.interval, this.intervalCount);
            }

            /**
             * Add a key/value pair to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.SubscriptionDetails.Item.PriceData.Recurring#extraParams}
             * for the field documentation.
             */
            public Builder putExtraParam(String key, Object value) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.put(key, value);
              return this;
            }

            /**
             * Add all map key/value pairs to `extraParams` map. A map is initialized for the first
             * `put/putAll` call, and subsequent calls add additional key/value pairs to the
             * original map. See {@link
             * InvoiceCreatePreviewParams.SubscriptionDetails.Item.PriceData.Recurring#extraParams}
             * for the field documentation.
             */
            public Builder putAllExtraParam(Map map) {
              if (this.extraParams == null) {
                this.extraParams = new HashMap<>();
              }
              this.extraParams.putAll(map);
              return this;
            }

            /**
             * Required. Specifies billing frequency. Either {@code day}, {@code
             * week}, {@code month} or {@code year}.
             */
            public Builder setInterval(
                InvoiceCreatePreviewParams.SubscriptionDetails.Item.PriceData.Recurring.Interval
                    interval) {
              this.interval = interval;
              return this;
            }

            /**
             * The number of intervals between subscription billings. For example, {@code
             * interval=month} and {@code interval_count=3} bills every 3 months. Maximum of three
             * years interval allowed (3 years, 36 months, or 156 weeks).
             */
            public Builder setIntervalCount(Long intervalCount) {
              this.intervalCount = intervalCount;
              return this;
            }
          }

          public enum Interval implements ApiRequestParams.EnumParam {
            @SerializedName("day")
            DAY("day"),

            @SerializedName("month")
            MONTH("month"),

            @SerializedName("week")
            WEEK("week"),

            @SerializedName("year")
            YEAR("year");

            @Getter(onMethod_ = {@Override})
            private final String value;

            Interval(String value) {
              this.value = value;
            }
          }
        }

        public enum TaxBehavior implements ApiRequestParams.EnumParam {
          @SerializedName("exclusive")
          EXCLUSIVE("exclusive"),

          @SerializedName("inclusive")
          INCLUSIVE("inclusive"),

          @SerializedName("unspecified")
          UNSPECIFIED("unspecified");

          @Getter(onMethod_ = {@Override})
          private final String value;

          TaxBehavior(String value) {
            this.value = value;
          }
        }
      }
    }

    public enum BillingCycleAnchor implements ApiRequestParams.EnumParam {
      @SerializedName("now")
      NOW("now"),

      @SerializedName("unchanged")
      UNCHANGED("unchanged");

      @Getter(onMethod_ = {@Override})
      private final String value;

      BillingCycleAnchor(String value) {
        this.value = value;
      }
    }

    public enum ProrationBehavior implements ApiRequestParams.EnumParam {
      @SerializedName("always_invoice")
      ALWAYS_INVOICE("always_invoice"),

      @SerializedName("create_prorations")
      CREATE_PRORATIONS("create_prorations"),

      @SerializedName("none")
      NONE("none");

      @Getter(onMethod_ = {@Override})
      private final String value;

      ProrationBehavior(String value) {
        this.value = value;
      }
    }

    public enum ResumeAt implements ApiRequestParams.EnumParam {
      @SerializedName("now")
      NOW("now");

      @Getter(onMethod_ = {@Override})
      private final String value;

      ResumeAt(String value) {
        this.value = value;
      }
    }

    public enum TrialEnd implements ApiRequestParams.EnumParam {
      @SerializedName("now")
      NOW("now");

      @Getter(onMethod_ = {@Override})
      private final String value;

      TrialEnd(String value) {
        this.value = value;
      }
    }
  }

  public enum PreviewMode implements ApiRequestParams.EnumParam {
    @SerializedName("next")
    NEXT("next"),

    @SerializedName("recurring")
    RECURRING("recurring");

    @Getter(onMethod_ = {@Override})
    private final String value;

    PreviewMode(String value) {
      this.value = value;
    }
  }
}




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