It looks like Square and other mobile payment solutions has a pretty big competitor entering the space. PayPal Here was just announced and the iPhone app can work in tandem with a credit card dongle to accept payments in real life.
When you buy something from the Apple Store, the employee can happily take your credit card right next to the iPods and MacBooks on display. When you turn around to sell your old iPod on Craigslist, you can do the same thing using the Square app. That’s right, the Square App is publicly available for the Apple iPhone, as well as with Android-based smartphones. Further still, they’ll gladly ship out a card reader so that you can start taking Visas and Mastercards with the best of them.