What vending machines support Apple Pay? Can any store/machine/etc that supports payments via NFC use Apple Pay? I thought the retailer also has to do something in their internal system to accept the Apple Pay transaction? Am I misunderstanding?
The merchant needs to have a terminal that accepts NFC payments which is not standard for time being, but all terminals need to be changed because of the requirement to change the system to EMV card by the end of 2015 and so all businesses have to change their POS terminals anyway and they can opt to get the ones with NFC, not a requirement per se, but it would be stupid if they don't. If they don't then it is related to high cost of changing the terminals and the even higher cost to change their backend payment system.
It is important to know the NFC and the terminals are not in any way specific to APPLE and can be used for any other system or NFC enabled cards as well.