Swiper no swiping
I happened to be in line behind a bunch of American tourists the other day trying to pay by credit card. The shop only had an EMV (chip and pin) reader, so the poor girl had to go to the back to get an old card imprinter and be taught how to use it.
I dare say that by the time American banks have rolled out their new fangled dangled cards, the US will be the market leaders in contactless biometric secured mobile wallets, just as they were behind in mobile phone technology, but eventually bought and destroyed Europe's best known phone manufacturer.