You have to scan the barcodes of the item/s you have purchased only. Scanning the barcodes on the receipts does not give us the correct information about your purchases. There's also a chance the scanner will not pick up the receipt's barcode at all or register the scan, which will cause you to miss out on your weekly points.
You should use the scanner in the same way you would use a self-checkout machine at your local grocery shop.
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