See What You Can Do:
https://developer.autodesk.com/ 

Change Site Properties with your own Autodesk Forge App Client ID and Client Secret

Configure your Autodesk Forge App Callback URL to Web Screen "Callback" to use the 3-Legged Token with authorization screen

The main usage of this API is available inside those examples on top menu as:
- OAuth with Scope permissions to general use
- OAuth 3-Legged to create a web app to get user Autodesk credentials and his files
- Get Logged User Autodesk Information
 -Create and List Buckets
- Create, Upload, Convert and List Objects
- Autodesk Viewer for 2D and 3D Objects (web block component to simple use)