Apple Pay doesn’t store credit card numbers on phones, so how does it identify the card that customers want to charge to?
a) A device account number is stored encrypted on a dedicated chip in the phone
b) Merchants tap an Apple credit-card database using the phone’s IMEI number
c) Credit-card issuers periodically update phones with a dynamic account proxy code
d) SMS messages sent to customer credit accounts trigger a back-end transfer of card information to merchants