Square’s first product, Square Register, allows registered members to accept debit and credit card payments on mobile devices by using the Square Reader, a small card-swipe dongle that plugs into the device's audio jack. Essentially, the Square Reader, which is provided for free, can turn an iPhone, iPad or Android mobile phone into a point of sale terminal.
Square followed this up with a product called Square Wallet. It's a digital wallet app that links the member's credit card information, loyalty cards and available gift cards to a Square account, allowing the member to pay for purchases wirelessly from vendors belonging to the Square Directory.Content Continues Below
This iPilot1 tutorial demo's the Square Register app user interface on an iPad.