curl --request GET \
  --url https://api-v2.watchcollect.com/v2/messages/{canonical_message_id}/occurrences/summary \
  --header 'Authorization: Bearer <token>'

{
  "total_count": 123,
  "group_count": 123,
  "session_count": 123,
  "days": [
    {
      "day_start_ms": 123,
      "occurrence_count": 123,
      "group_count": 123,
      "latest_at_ms": 123,
      "groups": [
        {
          "group_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
          "group_name": "<string>",
          "occurrence_count": 123,
          "first_seen_at_ms": 123,
          "last_seen_at_ms": 123,
          "session_labels": [
            "<string>"
          ],
          "edited_count": 123,
          "revoked_count": 123,
          "media_count": 123
        }
      ]
    }
  ],
  "first_seen_at_ms": 123,
  "last_seen_at_ms": 123
}