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Java implementation of JSON Web Token (JWT)
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package com.auth0.jwt.interfaces;

import java.time.Instant;
import java.util.Date;
import java.util.List;
import java.util.Map;

/**
 * The Payload class represents the 2nd part of the JWT, where the Payload value is held.
 */
public interface Payload {

    /**
     * Get the value of the "iss" claim, or null if it's not available.
     *
     * @return the Issuer value or null.
     */
    String getIssuer();

    /**
     * Get the value of the "sub" claim, or null if it's not available.
     *
     * @return the Subject value or null.
     */
    String getSubject();

    /**
     * Get the value of the "aud" claim, or null if it's not available.
     *
     * @return the Audience value or null.
     */
    List getAudience();

    /**
     * Get the value of the "exp" claim, or null if it's not available.
     *
     * @return the Expiration Time value or null.
     */
    Date getExpiresAt();

    /**
     * Get the value of the "exp" claim as an {@linkplain Instant}, or null if it's not available.
     *
     * @return the Expiration Time value or null.
     */
    default Instant getExpiresAtAsInstant() {
        return getExpiresAt() != null ? getExpiresAt().toInstant() : null;
    }

    /**
     * Get the value of the "nbf" claim, or null if it's not available.
     *
     * @return the Not Before value or null.
     */
    Date getNotBefore();

    /**
     * Get the value of the "nbf" claim as an {@linkplain Instant}, or null if it's not available.
     *
     * @return the Not Before value or null.
     */
    default Instant getNotBeforeAsInstant() {
        return getNotBefore() != null ? getNotBefore().toInstant() : null;
    }

    /**
     * Get the value of the "iat" claim, or null if it's not available.
     *
     * @return the Issued At value or null.
     */
    Date getIssuedAt();

    /**
     * Get the value of the "iat" claim as an {@linkplain Instant}, or null if it's not available.
     *
     * @return the Issued At value or null.
     */
    default Instant getIssuedAtAsInstant() {
        return getIssuedAt() != null ? getIssuedAt().toInstant() : null;
    }

    /**
     * Get the value of the "jti" claim, or null if it's not available.
     *
     * @return the JWT ID value or null.
     */
    String getId();

    /**
     * Get a Claim given its name. If the Claim wasn't specified in the Payload, a 'null claim'
     * will be returned. All the methods of that claim will return {@code null}.
     *
     * @param name the name of the Claim to retrieve.
     * @return a non-null Claim.
     */
    Claim getClaim(String name);

    /**
     * Get the Claims defined in the Token.
     *
     * @return a non-null Map containing the Claims defined in the Token.
     */
    Map getClaims();
}