Connect2Pay Payment Page Java Client

This is the Java implementation of the Connect2pay Payment Page API.

The main class to use is Connect2payClient that implements all the API calls.
It requires request object as entries and returns response objects.

Example of a payment creation with user redirection:

   // Process a payment of €39.99
   PaymentRequest request = new PaymentRequest();
   request.setOrderId("1234ABCD").setCurrency("EUR").setAmount(3999);
   request.setShippingType(ShippingType.VIRTUAL);
   request.setPaymentMode(PaymentMode.SINGLE);
   // User will be redirected here when clicking on "Go back to merchant" button
   request.setCtrlRedirectURL("http://my.website/somewhere");
   // The payment page will do a callback on this URL after the payment is processed
   request.setCtrlCallbackURL("http://my.website/payment-callback");
   
   // Validate the request
   try {
     request.validate();
   } catch (BadRequestException e) {
     logger.error("Ooops, an error occurred validating the payment request: " + e.getMessage());
     // Handle the error...
   }
   
   // Instantiate the client and send the prepare request
   // Second argument is the originator ID, third one is the associated API key
   Connect2payClient c2p = new Connect2payClient("https://provided.url", "123456", "GreatP4ssw0rd");
   PaymentResponse response = null;
   try {
     response = c2p.preparePayment(request);
   } catch (Exception e) {
     logger.error("Ooops, an error occurred preparing the payment: " + e.getMessage());
     // Handle the error...
   }
   
   if (response != null && ResultCode.SUCCESS.equals(response.getCode()) {
     // Get the URL to redirect the user to
     String redirectURL = response.getCustomerRedirectURL();
     if (redirectURL != null) {
       // Redirect the user towards this URL, this will display the payment page
     }
   } else {
     // Handle the failure
   }

Example of the payment callback handling:

   // Instantiate the client and handle the callback
   Connect2payClient c2p = new Connect2payClient("https://provided.url", "123456", "GreatP4ssw0rd");
   PaymentStatusResponse response = null;
   try {
     // Request is either the body of the received request as a string or an InputStream pointing to the received body
     response = c2p.handleCallbackStatus(request);
   } catch (Exception e) {
     logger.error("Ooops, an error occurred handling the callback: " + e.getMessage());
     // Handle the error...
   }
   
   if (response != null && ResultCode.SUCCESS.equals(response.getCode()) {
     // Check the payment status: 000 means success
     if ("000".equals(response.getErrorCode()) {
       // Handle the payment success case
       // ...
       // Access the payment mean information
       CreditCardPaymentMeanInfo pmInfo = response.getCCPaymentMeanInfo();
       logger.info("Successful payment done by " + pmInfo.getCardHolderName() + "with card " + pmInfo.getCardNumber());
     } else {
       // Handle the payment failure case
     }
     
     if (handledSuccessfully) {
       out.write(CallbackStatusResponse.getDefaultSuccessResponse().toJson()) // out is the output stream
     } else {
       out.write(CallbackStatusResponse.getDefaultFailureResponse().toJson()) // out is the output stream
     }
   } else {
     // Handle the failure
     out.write(CallbackStatusResponse.getDefaultFailureResponse().toJson()) // out is the output stream
   }