paypal reference transaction example

App.java

package com.cbandi.billing;

import java.io.IOException;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.concurrent.TimeUnit;

import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class App {
    private static final Logger log = LoggerFactory.getLogger(App.class);
    private static final String AUTH_URL = "https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=%s";

    private static final OkHttpClient okHttpClient = new OkHttpClient.Builder()
            .addInterceptor(new LoggingInterceptor())
            .readTimeout(60, TimeUnit.SECONDS)
            .build();

    public static void main(String[] args) throws IOException {
        //expressCheckout();
        //String billingAgreementId = createBillingAgreement();
        //doReferenceTransaction(billingAgreementId);
        doReferenceTransaction("B%2d7PN3209809538734N");
    }

    private static void expressCheckout() throws IOException {
        RequestBody body = new FormBody.Builder()
                .add("USER", "chethanbandi-facilitator_api1.gmail.com")
                .add("PWD", "LJKTSSP6NHP3R3UJ")
                .add("SIGNATURE", "AFcWxV21C7fd0v3bYYYRCpSSRl31AQR-m3oESR3VblA6.PArPx.X1TiQ")
                .add("METHOD", "SetExpressCheckout")
                .add("L_BILLINGTYPE0", "MerchantInitiatedBilling")
                .add("L_BILLINGAGREEMENTDESCRIPTION0", "SellinAll Services")
                .add("PAYMENTREQUEST_0_PAYMENTACTION", "AUTHORIZATION")
                .add("PAYMENTREQUEST_0_AMT", "0")
                .add("PAYMENTREQUEST_0_CURRENCYCODE", "USD")
                .add("cancelUrl", "http://www.return.com/")
                .add("returnUrl", "http://www.return.com/")
                .add("VERSION", "86")
                .build();

        String response = execute(body);
        String authUrl = Arrays.stream(response.split("&"))
                .filter(s -> s.startsWith("TOKEN"))
                .map(s -> s.split("=")[1])
                .map(s -> String.format(AUTH_URL, s))
                .findFirst()
                .orElse(null);

        log.info("Auth url\n {}", authUrl);
    }

    private static String createBillingAgreement() throws IOException {
        byte[] token = new byte[100];
        System.out.print("Enter token value : ");
        int bytesread = System.in.read(token);

        RequestBody body = new FormBody.Builder()
                .add("USER", "chethanbandi-facilitator_api1.gmail.com")
                .add("PWD", "LJKTSSP6NHP3R3UJ")
                .add("SIGNATURE", "AFcWxV21C7fd0v3bYYYRCpSSRl31AQR-m3oESR3VblA6.PArPx.X1TiQ")
                .add("METHOD", "CreateBillingAgreement")
                .add("VERSION", "86")
                .add("TOKEN", new String(token, 0, bytesread - 1, Charset.defaultCharset()))
                .build();

        return Arrays.stream(execute(body).split("&"))
                .filter(s -> s.startsWith("BILLINGAGREEMENTID"))
                .map(s -> s.split("=")[1])
                .findFirst()
                .orElse(null);
    }

    private static void doReferenceTransaction(String billingAgreementId) throws IOException {
        RequestBody body = new FormBody.Builder()
                .add("USER", "chethanbandi-facilitator_api1.gmail.com")
                .add("PWD", "LJKTSSP6NHP3R3UJ")
                .add("SIGNATURE", "AFcWxV21C7fd0v3bYYYRCpSSRl31AQR-m3oESR3VblA6.PArPx.X1TiQ")
                .add("METHOD", "DoReferenceTransaction")
                .add("AMT", "100")
                .add("CURRENCYCODE", "USD")
                .add("PAYMENTACTION", "SALE")
                .addEncoded("REFERENCEID", billingAgreementId)
                .add("VERSION", "86")
                .build();

        execute(body);
    }

    private static String execute(RequestBody body) throws IOException {
        Request request = new Request.Builder()
                .url("https://api-3t.sandbox.paypal.com/nvp")
                .post(body)
                .build();

        return okHttpClient.newCall(request).execute().body().string();
    }
}