Selling digital gift card by in-store card display stand

Each display stand has a QR code which is specific to a store. The customer scans the QR code using his phone. This will bring up a link which shows all the gift card brands that the store offers. The customer chooses a gift card, sets the amount, and finally chooses how he would like to receive the gift card code. He can choose to receive it physically (printed by EZPIN POS machine), or via SMS, WhatsApp or e-mail. Once the customer made all of the selections, a QR code shows up on his phone. Then the seller logs in to EZPIN POS machine and scans the QR code and confirms, with the customer, the type and the amount of the card. Finally, the customer makes the purchase and receives the gift card code.