code: private void addPostParams(final Request request) {
          if (to != null) {
              request.addPostParam("To", to);
          }
  
          if (channel != null) {
              request.addPostParam("Channel", channel);
          }
  
          if (customMessage != null) {
              request.addPostParam("CustomMessage", customMessage);
          }
  
          if (sendDigits != null) {
              request.addPostParam("SendDigits", sendDigits);
          }
  
          if (locale != null) {
              request.addPostParam("Locale", locale);
          }
  
          if (customCode != null) {
              request.addPostParam("CustomCode", customCode);
          }
  
          if (amount != null) {
              request.addPostParam("Amount", amount);
          }
  
          if (payee != null) {
              request.addPostParam("Payee", payee);
          }
      }
docs: Add the requested post parameters to the Request.
  
  @param request Request to add post params to