zlacker

That sounds good! Instead of NFC, they could use QR codes. All the payment terminals can show a QR code, and it's even possible to print a QR code on a piece of paper without the need for the terminal.

Twint does that. They started trying to make it "seamless" with NFC, but couldn't do it because of Apple (maybe now with the DMA it may change) and went for some kind of weird bluetooth stuff. Nobody used it. Then they moved to QR codes, and it quickly got very popular.

Everybody understands QR codes. No need to know whether your phone supports NFC or not, no need to go check if NFC is enabled in the settings, nothing. Everybody understands that they need to scan the QR code with their camera, period. Seems perfect to me.

>>palata+(OP)
> they could use QR codes

It already does for web purchases, so there is no reason it could not. Not sure why this is not more commonplace.