Whinge: but the term "Tap to Pay" winds me up. "Hover to Pay" maybe, or "Contactless" makes sense. But tap the card reader with your card and you disturb the touchscreen and cancel the payment. Don't tap it's a trick.
Is it possible that "contactless" actually refers to lack of electrical contacts (i.e., not using the gold pads)? We already have plenty of words for this idea: radio, wireless, inductive. Or is the intent to mean no physical contact whatsoever such that a tap would only be accidental?