In the very near future, I’ll be able to walk into the grocery store, have the cashier ring up a box of Graham Oh’s, say, “Oh, hi, I’m Tim Fernholz,” and walk away without handing over cash or cards. Nope, it’s not shoplifting—it’s Card Case, an innovative new app that aims to change the way we shop.

Card Case is the latest product from Square, the company co-founded by Twitter founder Jack Dorsey to revolutionize the way we pay. Square’s eponymous product is a card reader that plugs into your phone and allows you to process credit and debit card payments straight from your bank account, minus a 2.5 percent commission for the middle man.