code: private void addPostParams(final Request request) {
          if (sid != null) {
              request.addPostParam("Sid", sid);
          }
  
          if (phoneNumber != null) {
              request.addPostParam("PhoneNumber", phoneNumber.toString());
          }
  
          if (isReserved != null) {
              request.addPostParam("IsReserved", isReserved.toString());
          }
      }
docs: Add the requested post parameters to the Request.
  
  @param request Request to add post params to