In the shop, point your camera at a barcode and we’ll tell you whether the ticket is a real special. Just got home? One photo of the receipt watches the lot.
Hold the barcode inside the box, about 15 cm away. We read it twice before answering, so give it a second.
Lay it flat, get the whole receipt in frame, and keep your shadow off it.
The photo is read on your phone and never uploaded. We send the product names so we can match them — never the prices, the date, or the picture.