The USAePay .NET Library provides an interface for running server to server processing. The Library is for developing websites using .NET using the client side method, which provides a stable UI. The library is written in .NET.
Payleven, the Square equivalent for the world outside of the US, has launched an API to complement its mobile payment device. Prior to the API, use of Payleven's mobile payment device required downloading the Payleven app (similar to Square's current model). However, the API allows developers to integrate Payleven's functionality within third party apps.
How can developers make money? That’s a big question in the mobile app space, and the answer is changing. There has been a gradual recognition over the past few years that one-time payment for apps (those “paid apps” that we avoid downloading if we can) is not the happy-face solution for most developers aiming to be compensated adequately for the creative work they do.