I am using Smart Payment Buttons in Sandbox. Im almost finished. Can anyone tell me how can i simulate errors? I've turned on Negative testing. But what's next? I saw that the documentation does provide 2 methods of simulating errors. Those methods are: test values and request headers. But both methods seem to be unrelated to Smart Payment Buttons because these methods use something called "Payouts API" - which i dont have. I think i use Orders API. Please help.
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