So did I.I'm sorry but as a Mexican I found this comment hilarious, cards are accepted almost everywhere, even in some street market stalls.
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Actually all mobile payments use NFC, and so do contactless cards. Only Samsung has the technology to emulate a card swipe because they bought it from its original creator.Apple can't really do much about retailers that don't accept contactless/Apple Pay. Some of them, like Walmart, have chosen to keep Apple Pay and contactless out so that you use their payment app (Walmart Pay). Apple can only say to retailers "hey, we make things easier and more convenient, so please use contactless". Contactless payments aren't even Apple-specific, it works with Google Pay and some credit cards have RFID embedded, so really Apple and others just have to say "use this standardized technology please!" Also Samsung Pay isn't really per se accepted at stores, it uses MST technology to emulate a card swipe, so to "accept" Samsung Pay you just need to take credit card swipes. Apple uses NFC technology which has to be built into the reader and enabled in software.