I am using Smart Payment Buttons in Sandbox. I was able to try some successful transactions using sandbox credentials. Now I want to test transaction which will fail for xyz reasons. So how to simulate transaction which will fail. PLEASE provide us with CLEAR documentation on how to test the SMART BUTTON (not REST API, not SOAP, not NVM) for error conditions. There is something negative testing under the business account in the sandbox but there is no guide on what will happen if I turn it on.
... View more