1. Authentication and use of the Content API
The Apollo Apps Content API calls are secure through a auth system, not documented.
The Apollo Apps Plugin API gives access to methods that encapsulate the authentication and make it transparent in calls. Only requests to a section belonging to the app itself can be authenticated.
The Apollo Apps Content API should be used only in Plugins developed for Apollo Apps.
2. Content API modifications
The requests and responses of the Content API can change anytime.