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This Java library contains classes that allows you to do payments using Yandex.Money public API.

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package com.yandex.money.api.methods.params;

import com.yandex.money.api.utils.Strings;

import java.math.BigDecimal;
import java.util.HashMap;
import java.util.Map;

/**
 * Convenience class for P2P payment parameters.
 *
 * @author Dmitriy Melnikov ([email protected])
 */
public class P2pParams implements Params {

    public static final String PATTERN_ID = "p2p";

    private static final String PARAM_TO = "to";
    private static final String PARAM_AMOUNT_DUE = "amount_due";
    private static final String PARAM_MESSAGE = "message";

    private final String to;
    private final BigDecimal amountDue;
    private final String message;

    /**
     * Constructor.
     *
     * @param to recipient's account number
     * @param amountDue amount to receive
     * @param message message to a recipient
     */
    public P2pParams(String to, BigDecimal amountDue, String message) {
        if (Strings.isNullOrEmpty(to))
            throw new IllegalArgumentException(PARAM_TO + " is null or empty");
        this.to = to;

        if (amountDue == null)
            throw new IllegalArgumentException(PARAM_AMOUNT_DUE + " is null or empty");
        this.amountDue = amountDue;

        this.message = message;
    }

    /**
     * Constructor.
     *
     * @param to recipient's account number
     * @param amountDue amount to receive
     */
    public P2pParams(String to, BigDecimal amountDue) {
        this(to, amountDue, null);
    }

    @Override
    public Map makeParams() {
        Map result = new HashMap();
        result.put(PARAM_TO, to);

        result.put(PARAM_AMOUNT_DUE, amountDue.toPlainString());

        if (!Strings.isNullOrEmpty(message)) {
            result.put(PARAM_MESSAGE, message);
        }

        return result;
    }
}