Calling UCSD Catalog items from northbound API

I have just started using UCSD & been creating workflows to help orchestrate & automate some of our ACI Services.

I can create a workflow, make a call from Postman to invoke the workflow & it all works with no issue.

What I would like to do now is to make a similar Postman call, but to the UCSD Advanced Catalog item. I can find examples of Postman calls to retrieve Catalog items  available on the UCSD, but not any on how to call an item from a northbound API.

I am also trying to find out if I can get a list of the workflows/workflow tasks in each catalog via a northbound API call.

Has anyone had a similar requirement & have you found/created any examples that you could share.

here is an example how to call a workflow via API

UCSD Call a Workflow via API