They could also take on Square by moving the "confirm, sign, tip, send receipt" aspect of Square (basically the entire interface) to the phone anywhere there is

They could also take on Square by moving the "confirm, sign, tip, send receipt" aspect of Square (basically the entire interface) to the phone anywhere there is a payment system that takes tap to pay which more and more is basically everywhere. Unfortunately google doesn't agree and the actual payment experience is so shitty and limited it is a joke.