How do I return something I returned with Android Pay?
With purchases made with Android Pay, you use your virtual account number to process a return. You will follow a similar process as you do for regular returns, but in addition to the paper receipt, you may need to tap your phone to the payment terminal again to complete the return. To view the last four digits of the virtual account number, go to "Card details" or "Transaction details." Alternatively, hold your device near the contactless terminal and select the card you used to make the purchase.