Recently I noticed a new device on the counter at the local McDonald's near campus:
Look closely. This credit card terminal lets you swipe your card - as expected - and it lets you tap your card.
The oil company Mobil pioneered the concept years ago, with a small device you could easily put on your key ring. Hold your key ring with a smal special RFID device near the gas pump, and it authorizes a claim against your credit card. Now McDonald's and the credit card industry have caught up.
Fast food; fast payment. It's coming, and soon.