Error responses for Protected Resources in Keycloak Admin REST API

I have a confidential client which uses client credentials flow and then calls various Protected Resources in Keycloak Admin REST API.

Which HTTP response codes and what error response content can I expect from Admin API?

I’m looking for a complete reference - response codes, error codes, response structures.

The documentation over at Keycloak Admin REST API doesn’t seem to mention anything and I couldn’t find in other Keycloak docs either.

Where can I find that information?