If you haven't tried Samsung Pay, we really really would recommend you do so with the Galaxy S8. It's lightyears ahead of Apple or Google Pay, and is actually one of our most favorite features.
Samsung Pay works at virtually 95% of retail stores throughout the United States. See, Apple Pay and Google Pay only work at new, updated terminals with a technology called NFC. Samsung Pay has that too, but it also has a magnetic strip signal similar to anywhere in the world you swipe a credit or debit card. See the benefit? You can upload a debit card, leave your wallet at home, and pay for anything and everything right with your phone.
It saves rewards cards, and they have their own reward program that's pretty good too. Try Samsung Pay on the Galaxy S8, and it may become your favorite feature like it did me.