In the west, but in China you pay everything with wechat or alipay and similar solutions are popping up in Asia in every country with success. But in China it is accepted everywhere. And when it is not it still is because usually the shop cashiers will use their own phone to complete the transaction.

Maybe in the US; here in the UK, contactless payment is now close to universal for any vendor who accepts cards. This suggests it’s eminently possible.