Hey @smozgur,
The way you connect a meeting occurrence (before it happens), with a meetingUUID (after it happens), is with the List Ended Meeting Instances endpoint.
Since the meetingID is the same between the two, you pass in the meetingID, and out comes the list of occurrences with the meetingUUID, which you can use to call the Participants Metrics and Reports endpoints.
Does that make sense?
(FYI the occurrence_id is not present in the List Ended Meeting Instances endpoint, but you can infer the occurrence with the start_time. A great improvement to this endpoint would be including the occurrence_id, do you agree?)
Thanks,
Tommy