public void onPaymentsNotFound() {
   view.displayNoPaymentsFound();
 }
 public void onPaymentsFound(List<SyncPayment> payments) {
   view.displayPayments(payments);
 }
 public void onPaymentFailure() {
   view.displayPaymentFailure();
 }
 public void onPaymentError() {
   view.displayPaymentError();
 }
 public void onPaymentSuccess() {
   view.displayPaymentSuccess();
 }