curl --request GET \
  --url https://api.heygen.com/v3/video-agents/{session_id} \
  --header 'x-api-key: <api-key>'

{
  "data": {
    "session_id": "<string>",
    "created_at": 123,
    "progress": 0,
    "title": "<string>",
    "video_id": "<string>",
    "messages": [
      {
        "role": "<string>",
        "content": "<string>",
        "created_at": 123,
        "resource_ids": [
          "<string>"
        ]
      }
    ]
  }
}