How to make a simulated payment system?

Sawing on trip your bike, I want to test and write a response processor. What, on click I open the page with the "payment" where I have entered or not entered data in the field and the server returned the answer, and I threw back on checkout.
April 19th 20 at 12:04
2 answers
April 19th 20 at 12:06
Almost in all payment systems there is a test mode just for this
April 19th 20 at 12:08
Hello!
I agree with the colleagues. Definitely have a test account to check. Sometimes they provide not only the key to an IPA, but left credit cards to simulate the payment.
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