All your payment cards stored in Microsoft Wallet are assigned a device account number. This number is used instead of your actual card number when you make a purchase with Microsoft Wallet, so that your payment information isn’t shared with the merchant.
If you ever need to make a return, you might have to provide the last 4 digits of your device account number. The device account number can be found by selecting the card in Microsoft Wallet and tapping to go to the about screen.
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