This form of payment has been available in the UK for a little while. You can pay for your goods "Contactless" (up to £30) using an appropriate card, smartwatch, fob, sticker, smartphone, etc...
The banks say: "Touch your Contactless Payment Card (device) on a payment reader at thousands of your favourite retailers across the UK and you've paid, just like that! There's no need to fumble with cash, or enter a PIN and what's more it's ready to use today."
Many of us take these payment methods for granted. However:
Are these forms of payment secure?
Do I need a RFID blocking Wallet?