We encourage developers to build and test against the http://sandbox.cleeng.com server.
The Cleeng Sandbox is a testing environment made for new and existing broadcasters to know the main functionalities of Cleeng's production environment. When we release new feature we release it in the Sandbox too, so that you can test it easily.
The main benefit of the Sandbox is that broadcasters may use this before going live with Cleeng to reduce the number of questions about the platform's features. It is also a way to test your actual implementations and functions.
Note: It is important to know that the API key, your user account, and the actual content references you are creating are NOT replicated in the production environment.
For more information, see the Cleeng Sandbox and Production Environments article.