curl --request GET \
  --url https://api.devin.ai/v3/organizations/{org_id}/sessions/{devin_id}/messages \
  --header 'Authorization: Bearer <token>'

{
  "items": [
    {
      "created_at": 123,
      "event_id": "<string>",
      "message": "<string>",
      "source": "devin"
    }
  ],
  "end_cursor": "<string>",
  "has_next_page": false,
  "total": 123
}