This is awesome! Although, I think you should add that selling digital content in your app via this will cause your app to violate ToC's for Android and iOS as they already have in payment schemes for digital content. However, for physical purchases, this is a huge value add and makes life much easier for people! As a side thought, I wonder if this opens up competition for Square (maybe make an app that accepts payments only by taking a picture of a credit card?). I don't know if it does or not, but its worth some thought.
As for Square, they're for in-store transactions. We're not targeting that segment at all.
Cool! I should rtfm once in awhile before I post! I just didn't want anyone to start a project only to have it removed for ToS violations! This is really cool, and excited to see what people build with it.