Replacing a lost gift card on Shopify POS
If a customer loses the details of a gift card that they've bought, then you can disable it from Shopify POS and issue a new gift card free of charge from your Shopify admin.
To replace a gift card with Shopify POS:
Search for and view the order so that you can verify the customer's identity.
On the order details screen, tap the gift card number to see the remaining balance on the gift card, and then tap Disable gift card (this can't be undone).
Issue a new gift card to the customer for the amount that was left on the lost gift card.