Hi Wendy,
There are two places to underline programmatic ReST api access (Sorry i am in transit and unable to send you the links; let me know if cannot find the topics and will send info additionally). Those are:
1) The ITEM-facing V1 API guide found on our Online Help portal.
2) The FILE-facing DM API guide found on our new forge.autodesk.com<> portal.
Whats the use case you're exploring if i may ask? I may help out direct you in the right area of the apis. Be mindful that for the FLC with cPDM environments, the 3) ATTACHMENT-facing (item>file) API is not available for consumption presently. This is something we are working on as we speak.
HTH,
Martin Gasevski | Fusion 360 Team Product Manager