The Data Management API provides a unified and consistent way to access data across A360, Fusion 360, and the Object Storage Service.
With this API, you can accomplish a number of workflows, including accessing a Fusion model in A360 and getting an ordered structure of items, IDs, and properties for generating a bill of materials in a 3rd-party process. Or, you might want to superimpose a Fusion model and a building model to use in the Viewer.
All of the Autodesk services are governed by the following Terms of service http://www.autodesk.com/company/legal-notices-trademarks/terms-of-service-autodesk360-web-services/autodesk-web-services-api-beta-terms-of-service
The status of the Autodesk services can be found here https://developer.autodesk.com/en/support/api-status
Authentication is done with a 3-legged token a guide on how to create an application and retrieves the bearer token is available in the Forge Documentation
There is a wealth of tools and libraries available for the forge services on their Github