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 “Passbook &
Apple Pay” section in your device “Settings”
or look on the back of your card in the
Passbook app.