2- legged Access Grant for Token Flex APIs

The Token Flex API enables Autodesk Token Flex/CORE enterprise users to access token consumption, product usage, and contract details, facilitating integration with business intelligence solutions for custom reporting.

It requires a 3-legged access token from an admin for most cases, while two-legged authentication allows simpler server-to-server communication.

For two-legged access, users must fill out a waiver. Key APIs mentioned include the Token Flex API and its usage data API documentation is available online.

You can find additional details in this blog