Some of the holiday-themed gift cards have a QR code on the back of the slip that is attached to the gift card. If you simply turn it over and start scanning it and accidentally hit the QR code and not the actual barcode, it will still prompt you to put in an amount. The only difference is that if you scan the QR code, no value will actually be added. It will still ring up and charge the guest, but the value won't be added to it like it would if you scanned the barcode. My store has actually known about this for like a month now. I think one of the gstls said it was at least $250,000 in gift cards that were scanned incorrectly. That was about a month ago so that number is definitely higher now.