Embedding a category in WordPress

I have a private membership WordPress site, and I want to add a private discussion board to. My purpose is to keep it accessible to members only, as long as their membership is maintained (which I guess I achieved via SSO).

The issue I’m facing now is to embed an entire category along with the posting ability right inside WordPress, without leaving the dedicated WordPress page.

I have WordPress and Discourse installed on two different subdomains. Say:

I was wondering, is this scenario even doable? If it is, what steps should I follow?


Do you mean installed on subdomains of two different domains? (example.com & discussion.com?)

Actually they’re two subdomains of the same primary domain