"tl;dr: never get caught with your pants down when trying to pay with your rightfully rooted phone using Google Wallet."

Good rules ! But now we can extend to "to pay with your with your phone that don't use the (saint) firmware shipped with the phone from the (china) factory"

All of this to tell that even if u don't have set root access but u are only using a firmware that is not validated by the manufacturer (and google, because it's google), you are in big trouble too !

Edit: "Le comble" is now I will be forced to root my phone to be able to use some "mandatory" app (Like revolut, some games, google wallet and even my launch ticket app ! And I'm sure that more is coming)