(CBS/AP) NEW YORK - Groupon (GRPN) is launching a new service that allows businesses to run credit cards using an iPhone or iPod Touch, the latest company to seek a portion of that growing market.

As Groupon’s stock (GRPN) hovers near its all-time low, the company is testing a new approach to customer service: hiring agents in India to answer e-mails now handled by Chicago-based employees. The ...