The C# (.NET) library for Windows is for use with the Bloomberg API. The Bloomberg API provides free, unrestricted access to raw financial data and is part of their Open Market Data Initiative. The library is offered under a "free-use" license, which allows unrestricted access to the interface's header file, documentation, and programming examples. Extensive documentation, including code examples, is available in the Developer Documentation and at the API website.
Payments NZ, an organization charged with payments governance in New Zealand, has released its first two API standards. The Payment Initiation specification and the Account Information specification were both piloted by major NZ banks and API providers. Version 1 of both are now available.