In order to make sure that people want to buy their products, product managers have to stay on top of changes in the technology that people use to make payments. 

This used to be fairly easy: once upon a time everyone used cash, then they migrated to using credit and debit cards, next came PayPal and the like. Over in China product managers are once again moving forward in the area of payments and they are making changes to their product development definition. 

Chinese product managers are trying to get people to put their mobile phones away and make payments using facial recognition systems.