But how exactly are you going to discover it? If transaction is deleted from the local log, you need to subpoena all payment processors and cross-reference, which takes non-trivial amount of effort.
I new a guy who was developing hacked firmware for POSes in the 90ies. One of the cool features he had is that at the end of the day the owner could unlock secret mode, enter amount of sales he wanted, and POS would create entire fake log spaced through the day and print it on tape, update electronic counters and then lock, and again behave like normal terminal ready for inspection.
I new a guy who was developing hacked firmware for POSes in the 90ies. One of the cool features he had is that at the end of the day the owner could unlock secret mode, enter amount of sales he wanted, and POS would create entire fake log spaced through the day and print it on tape, update electronic counters and then lock, and again behave like normal terminal ready for inspection.