curl --request GET \
  --url https://api.illuminalab.com/v1/resources/{resourceId}/threads/{threadId}/messages \
  --header 'authorization: <authorization>'

{
  "messages": [
    {
      "id": "<string>",
      "thread_id": "<string>",
      "role": "<string>",
      "parts": "<string>",
      "metadata": "<string>",
      "created_at": "<string>"
    }
  ],
  "total": 123
}