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I was rather surprised when I tried your sample code with a transaction that was supposed to fail and it still said Ok for the resultCode, which per your samples indicates a successful transaction, but in reality it fails. How the response should be ...

This is for a retail (food oriented) POS environment. My .Net app will be on a PC and communicate with the reader. I've found a few things that suggest debit cards are processed exactly like credit cards but only if they are Visa/MC and don't require...