If Joes Diner gives you a free slider every ten meals, you may no longer need to schlep around a punch card if you use PayPal. Its latest iOS app now works with loyalty cards from select retailers just by scanning a barcode on your physical card. Thatll save it into your PayPal wallet in a similar way to Apples Passbook and Microsofts Wallet, letting you score discounts or other deals.
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