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Not quite the same thing you're talking about, but Groupon's deals usually say you can either show them to your server from your smartphone or print the coupon. I don't Groupon much, but one restaurant I went to, the server said they have a hard time with the scans from smartphones.
I do have *two* loyalty cards (CVS and Meijer) where you can pick certain deals/coupons on line and have them go to your card. So as long as you remember to go buy whatever it was, it'll automatically be done through the loyalty card.
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