MC Paypass and other variants of the RFID chip payments are usually limited to 25$/€ or less. So if the charge is higher it will print a slip to sign or prompt you to insert/swipe the card.

My German M&M MC had paypass since about 2008. I noticed that when I waved my wallet on the card reader at a gas station in the US, expecting it to charge the spg Amex express pay, but it picked up the MC paypass instead

In Germany I have seen the 'tap and go' on many POS in the past months:



I always try to hold my paypass card near it and to the surprise of many cashiers it works like a charm.^