NFC terminals aren’t expensive - especially since they can be a cheap phone now.
QR without validating payment received is probably only viable up to maybe $10USD before the risk of being defrauded is too high.
I bet you’ll find lots of one way QR shops have a phone that they verify they’ve received payment on anyway.
And, yeah, most places do verify based on another phone.
NFC terminals aren’t expensive - especially since they can be a cheap phone now.
QR without validating payment received is probably only viable up to maybe $10USD before the risk of being defrauded is too high.
I bet you’ll find lots of one way QR shops have a phone that they verify they’ve received payment on anyway.