Seems like something PoS vendors could collaborate on. They don't need to own the review app, just be able to provide the tokens. Alternatively it could be some

Seems like something PoS vendors could collaborate on. They don't need to own the review app, just be able to provide the tokens. Alternatively it could be some kind of add-on like cryptic looking codes restaurants in Québec have for their receipts: https://reverseengineering.stackexchange.com/questions/6856/reverse-engineering-quebec-canada-pdf417-restaurant-bills https://reverseengineering.stackexchange.com/questions/6856/...