This documentation is for the Engine Yard Add-on APIs. Before you may use any of these APIs, you must signup as an Engine Yard partner. The steps are:
Engine Yard maintains two different sets of APIs to address the different needs of a diverse community of Add-on developers.
If you have already integrated your application with other leading Marketplaces (Heroku, AppHarbor etc. ) or are planning on doing so at some point in the future, you should consider using the Haiku API, which is based on a the open-source Kensa SDK.
If you have already integrated your application as an Engine Yard Add-on as of Dec. 12, 2013, you are using the Sonnet API. Sonnet is designed to be a more flexible API for Add-ons that don't fit well within the Kensa model. However, with the flexibility comes some added complexity. Also it is an Engine Yard proprietary API, so you may not be able to leverage your work with other Marketplaces. We plan to continue to support Sonnet going forward.
The major API differences include:
More on the unique features of each API are in the API documentation links on this page.