It’s an app that’s been put together by co-creators of Twitter and it can turn your tablet or phone into a cash register. You can even handle credit cards and business can be done on the move. You have to pay a 2.75% transaction fee per swipe but there are no monthly charges or hidden costs. You can get your hands on the funds in a day or two. You can order your free Square Register device, which is capable of reading cards swept across it.