This project could be useful for testing api endpoints.
ROOT_SECRET_ID=
ROOT_SECRET=
In the postman json folder, is a JSON called API.postman_collection.json you can import into your postman application. This JSON already includes a way to automatically add the RPC token header to all your requests within the API folder.
This JSON also inlcudes a couple of example request, such a the get user/me, put /sapi/creative/{id}, the solr get /api/mediaclip?action=getSolr&id=7106 and more.
To make your postman request work you will, also need to import the formatengine environment variables. These variables are included in the postman json folder in the file called formatengine.postman_environment.json.
When testing the local instance of the format engine, you should use http://localhost:80 as the url.