Define All the Objects

I've attempted to create all the properties for each object on the Box API reference, allowing this package to effectively parse all the information contained in JSON payloads received from Box.

Next-step: Files & Folders managers that can create, request, delete and update files & folders.

Folders & Tokens

The first few bits are in place. Access tokens can be requested with JWT authentication, the folders endpoint can be used to request a folder object.