Hello World sample code

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import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.security.KeyStore;
import java.util.Base64;

public class Helloworld {

 public static void main(String[] args) throws Exception {

 System.out.println("START Sample Code for Two-Way (Mutual) SSL");
 URL url = new URL("https://sandbox.api.visa.com/vdp/helloworld");

 HttpURLConnection con = (HttpURLConnection) url.openConnection();

 // THIS IS EXAMPLE ONLY how will cert and key look like
 // keystorePath = "visa.jks"
 // keystorePassword = "password"

 String keystorePath = "<YOUR JAVA KEYSTORE PATH>";
 String keystorePassword = "<YOUR KEYSTORE PASSWORD>";
 // Make a KeyStore from the PKCS-12 file
 KeyStore ks = KeyStore.getInstance("PKCS12");
 try (FileInputStream fis = new FileInputStream(keystorePath)) {
 ks.load(fis, keystorePassword.toCharArray());
 }

 // Make a KeyManagerFactory from the KeyStore
 KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
 kmf.init(ks, keystorePassword.toCharArray());

 // Now make an SSL Context with our Key Manager and the default Trust Manager
 SSLContext sslContext = SSLContext.getInstance("TLS");
 sslContext.init(kmf.getKeyManagers(), null, null);
 if (con instanceof HttpsURLConnection) {
 ((HttpsURLConnection) con).setSSLSocketFactory(sslContext.getSocketFactory());
 }

 con.setRequestMethod("GET");
 con.setRequestProperty("Content-Type", "application/json");
 con.setRequestProperty("Accept", "application/json");

 // THIS IS EXAMPLE ONLY how will user_id and password look like
 // userId = "1WM2TT4IHPXC8DQ5I3CH21n1rEBGK-Eyv_oLdzE2VZpDqRn_U";
 // password = "19JRVdej9";
 String userId = "<YOUR USER ID>";
 String password = "<YOUR PASSWORD>";

 String auth = userId + ":" + password;
 byte[] encodedAuth = Base64.getEncoder().encode(auth.getBytes(StandardCharsets.UTF_8));
 String authHeaderValue = "Basic " + new String(encodedAuth);
 con.setRequestProperty("Authorization", authHeaderValue);

 int status = con.getResponseCode();
 System.out.println("Http Status: " + status);

 BufferedReader in;
 if (status == 200) {
 in = new BufferedReader(new InputStreamReader(con.getInputStream()));
 } else {
 in = new BufferedReader(new InputStreamReader(con.getErrorStream()));
 System.out.println("Two-Way (Mutual) SSL test failed");
 }
 String response;
 StringBuffer content = new StringBuffer();
 while ((response = in.readLine()) != null) {
 content.append(response);
 }
 in.close();
 con.disconnect();

 System.out.println(content.toString());
 System.out.println("END Sample Code for Two-Way (Mutual) SSL");
 }
}