API Overview
This documentation is split into two primary topics, the RESTful API specification itself, and the PHP SDK documentation. For those who are working with PHP, it is recommended that you use the PHP SDK, which will make your job much easier, as well as make maintenance much simpler. For those who are working with other languages, you will need to work with the RESTful API directly.
In either case, you may wish to read the API overview pages to get an understanding of how the API works and what it presents to you. Below are the links to these overview pages, as well as links to the RESTful API and PHP SDK documentation.