Official comment
Hi Michael,
Just to make sure, do you need a detailed list of all fields in a specific Clarizen item type (Projects, Tasks..)?
If so, please try this:
curl -X GET -H "Authorization: Session enter_session_id" "https://api2.clarizen.com/V2.0/services/metadata/DescribeEntities?typeNames=Project,Milestone"
Replace "enter_session_id" with a valid session id.
You can see the API documentation here: https://api2.clarizen.com/V2.0/services/metadata/DescribeEntities
You can view the Clarizen's data model here: https://success.clarizen.com/hc/en-us/articles/206926997-Data-Model