How are refunds handled with an Apple Pay purchase?
If you need to make a return for a purchase made with Apple
Pay, you may be asked to provide to the cashier the last four digits of your
Device Account Number instead of the last few digits of your card number.
To find the last four digits of your Device Account
Number for each card, visit the “Wallet & Apple Pay” section in your device
“Settings” or look on the back of your card in the Wallet app.