With autopay the payment is done automatically by reading a proximity device on the filling hole, with credit/debit cards you put the card in to activate the pump, not at the end of pumping.

Go out of the car, put nozzle on other side of the car, go back inside the car waiting for it to be done, assume a station worker took the nozzle out, drive, hear a station worker screaming, drive back to return part of the pump.