At first brush, I was ready to discount this as an also-ran, but this actually seems like something that could take off in restaurants in the US IMO.
Handing over a credit card and then signing a receipt isn't a particularly convenient way to pay, and NFC tags don't make it any better. But printing out a QR code at each table that you can scan, see your receipt and add a tip without doing any calculations actually seems like a better experience.
Gas Stations seem similar, in that NFC doesn't buy you a lot, since a bunch of them want to see ID before charging you, and if Amazon can do a better job of fraud detection and not require you to actually go into the gas station, that could be a real convenience to customers.
Handing over a credit card and then signing a receipt isn't a particularly convenient way to pay, and NFC tags don't make it any better. But printing out a QR code at each table that you can scan, see your receipt and add a tip without doing any calculations actually seems like a better experience.
Gas Stations seem similar, in that NFC doesn't buy you a lot, since a bunch of them want to see ID before charging you, and if Amazon can do a better job of fraud detection and not require you to actually go into the gas station, that could be a real convenience to customers.