I'm developing a self-checkout kiosk for quick service restaurants. The customer will generate their order on the kiosk and I'm looking for a POS terminal to use to actually process the customer's payment (via credit card or debit card). Which POS terminals support sending it the order price via an interface, having the terminal complete the transaction with the customer, and then sending a signal back to the kiosk when the payment transaction is complete?
This seems like it should be fairly straight-forward, but I'm having a lot of trouble understanding which vendors offer this kind of functionality, and what kind of systems their POS terminals will and won't talk to.
Thanks!