Clients including Dunkin’ Donuts, Taco Bell, and Sonic used CardFree’s end-to-end mobile payment and commerce service to generate $550 million in purchase volume last year. Most business on the CardFree platform is initiated by a mobile phone. The company was formed five years ago by the principals behind the mobile payment programs at Starbucks and Dunkin’ Donuts, which are the top two private label stored-value programs in the U.S. CardFree focuses on providing enterprise through merchants with an end-to-end service including front-end order app, integration to the point-of-sale sys...