How to display information from the POS-terminal about a successful transaction?

Question

Payment systems

Those. there is a POS terminal and you need to output a signal about a successful transaction from it, for example, as a logical signal. I was thinking if I could remove contacts from the control tracks of a printed receipt printer, as an option. Is such a solution possible, can anyone come across or know the device of a POS-terminal?

Answer 1

I believe the pos-terminal is connected to something, it sends something to the bank and information about the success or failure of the transaction arrives from the bank ... And if something exactly in this area would be correct to catch information about the success of the transaction ( api of the bank)
And so - well, we cling to the fact of printing ... The client applies a crooked card, "stop the thief" arrives from the bank, the terminal prints "it is necessary to withdraw the card !!!" and ???
ps It's better then to catch the success of printing a check by a cash register (well, or a similar event from a web cash register), which indirectly receives information about a successful payment.