public void CreditServiceVoid() { Transaction response = service.Charge(19m) .WithCurrency("USD") .WithPaymentMethod(card) .Execute(); Assert.IsNotNull(response); Assert.AreEqual("00", response.ResponseCode); Transaction voidResponse = service.Void(response.TransactionId).Execute(); Assert.IsNotNull(voidResponse); Assert.AreEqual("00", voidResponse.ResponseCode); }