/**
 * @test
     /// MasterCard refund test.
 */
 public function MasterCard_ShouldRefund_Ok()
 {
     $testConfig = new TestServicesConfig();
     $chargeSvc = new HpsCreditService($testConfig->ValidMultiUseConfig());
     $chargeResponse = $chargeSvc->charge(25.0, "usd", TestCreditCard::validMasterCreditCard(), TestCardHolder::certCardHolderShortZipNoStreet());
     $refundResponse = $chargeSvc->refundTransaction(25.0, "usd", $chargeResponse->transactionId);
     $this->assertEquals($refundResponse->responseCode, "0");
 }