1

is it possible to build an app that works with a Credit Card Reader?

2

sure, with stripe probably. there’s stripe terminal

3

You can use most credit card readers if you are well versed in the API connector, but as far as plugins currently I’m only aware of 1 that exists that allows you to use a Stripe Terminal. It’s been a few years since I used the plugin, but I do know that the plugin was for a now unsupported reader.

4

square is probably you’re best bet

I looked at this a while ago but decided not to proceed but I remember square having a fairly robust api for this