Groupon (GRPN 2.34%) shares were up more than 13% Wednesday morning, thanks to its launch of a new mobile payment system in the U.S.
This should prove attractive to businesses, as Groupon will pocket a lower transaction fee than eBay's (EBAY -0.75%) PayPal.
It's still too early to tell if this will upend the likes of PayPal, Square, and other mobile payment systems, but it's a much-needed expansion to Groupon's business model.
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