(Java) ABN AMRO OAuth2 Client Credentials Authentication

Demonstrates how to obtain an access token for an ABN AMRO online API using OAuth2 with the Client Credentials flow.

For more information, see https://developer.abnamro.com/api/payment-initiation-v1/payment-initiation-tutorial

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // This example sends the following CURL request:

    // 	curl -X POST -k https://auth-sandbox.connect.abnamro.com:8443/as/token.oauth2 \
    // 	-v \
    // 	--cert TPPCertificate.crt \
    // 	--key TPPprivateKey.key \
    // 	-H 'Cache-Control: no-cache' \
    // 	-H 'Content-Type: application/x-www-form-urlencoded' \
    // 	-d 'grant_type=client_credentials&client_id=TPP_test&scope=psd2:payment:sepa:write psd2:payment:sepa:read'

    CkCert cert = new CkCert();
    boolean success = cert.LoadFromFile("qa_data/certs/TPPCertificate.cer");
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
        }

    CkBinData bdKey = new CkBinData();
    success = bdKey.LoadFile("qa_data/certs/TPPprivateKey.key");

    CkPrivateKey privKey = new CkPrivateKey();
    success = privKey.LoadAnyFormat(bdKey,"passwordIfNeeded");
    if (success != true) {
        System.out.println(privKey.lastErrorText());
        return;
        }

    success = cert.SetPrivateKey(privKey);
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
        }

    CkHttp http = new CkHttp();

    success = http.SetSslClientCert(cert);
    if (success != true) {
        System.out.println(http.lastErrorText());
        return;
        }

    CkHttpRequest req = new CkHttpRequest();
    req.AddParam("grant_type","client_credentials");
    req.AddParam("client_id","TPP_test");
    req.AddParam("scope","psd2:payment:sepa:write psd2:payment:sepa:read");

    CkHttpResponse resp = http.PostUrlEncoded("https://auth-sandbox.connect.abnamro.com:8443/as/token.oauth2",req);
    if (http.get_LastMethodSuccess() == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    if (resp.get_StatusCode() != 200) {
        System.out.println(resp.bodyStr());

        return;
        }

    // Get the JSON result:
    // {"access_token":"TIhycwl8rfrZPkXGw15mwldASAAK","token_type":"Bearer","expires_in":7200}
    CkJsonObject json = new CkJsonObject();
    json.Load(resp.bodyStr());
    System.out.println("access_token: " + json.stringOf("access_token"));
    System.out.println("token_type: " + json.stringOf("token_type"));
    System.out.println("expires_in: " + json.stringOf("expires_in"));
  }
}