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Did you mean: payment via card reader

Im planning to integrate a card reader like the one below in my ios app which will work as a self service kiosk. /echatspin /echatrandom

In this case how does the payment flow work? From the reader to the app what information do we get when someone inserts a card? Does it complete the payment with a merchant or do we just get the card number and required info and we have to make an API call?

I already have a web based api which accepts as input credit card number etc and accepts payments. I'm using for payments. Can I use the same API with a device like this?