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Simulate errors with PayPal's Smart Payment Buttons

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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