I suspect that Apple will have full control of the screen, like Apple Pay. Your POS app will call an apple+(stripe/other) api which will show the payment screen and enable the NFC hardware.
There will be no way of an app to display a fake payment screen in front of the real one, or accessing the NFT apis themselves. It's clearly one of the key reasons why Apple have not opened up the NFC hardware for outside developers.
There will be no way of an app to display a fake payment screen in front of the real one, or accessing the NFT apis themselves. It's clearly one of the key reasons why Apple have not opened up the NFC hardware for outside developers.