Groupon has updated its Android app for merchants to incorporate Groupon Payments so they can accept credit cards with it. Groupon says the service can be activated within minutes, and can be used to enter bill totals, add tips, apply …

Square, the other company that Twitter co-founder Jack Dorsey runs, which offers a device anyone can plug into their smartphones to accept credit cards, has announced that 1 million merchants are now using Square. According to Dorsey, only 8 million …