Than you for your patience, and Fantastic! I am new to discourse and managing forums, the wording for Discourse API Docs topic_id could be clearer. ‘Required when replying to topic or post.’ or similar.
In regard to group_id? How is this discoverable? In the GUI, I see the title, short_name (name) and nothing else. From the api docs, it looks like I need to GET from /admin/groups.json, but that returns no value.