I don’t quite understand how electronic payments came about after physical payment. How did they know for certain it would always work and there would be errors and things would get sent such as a payment or refund. How did people know it could be trusted to a point where it’s now probably the main payment method.
I don’t understand how they managed to take that leap.
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They invented and tested the contactless communication mechanism until it was extremely reliable. It can detect errors and recover or force a retry or recognize the error and prompt the user. This took a long time and a lot of testing. Then they ran payments over this new way of communicating between phone and payment terminal. Almost the same as a payment you do online.
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