Following the likes of PayPal and Square, Groupon has revealed that it’s releasing its own credit card payment service called Groupon Payments. Groupon Payments will be available for the iPhone and iPod touch, and participating merchants can get free plastic dongle for swiping credit cards or pony up for a $100 smartphone case/credit card slider. According to Groupon’s website, the company will only take 1.8% of transactions processed on Discover, MasterCard and Visa cards. Read the full story at Boy Genius Report.