Having customers check in at a location via Foursquare or some other such service is so 2010. That’s the message from start-ups DailyGobble and RewardLoop, both of which use customer receipts rather than check-ins to give diners or shoppers rewards.
With DailyGobble, diners at participating restaurants use their smartphones to take a photo of their receipt and then upload it via the company’s app, triggering a cash-back payment via PayPal.
RewardLoop works in a similar way, but in this case, the receipt carries a QR code imprinted on it that the smartphone reads. This is more secure and less open to user fraud; on the other hand, the restaurant or store must rent the machine that creates the code.
Read more at CNET.