{
  "endpoint_type": "extend",
  "payload": {
    "video_id": "866887269973246011",
    "prompt": "Continue naturally for a few more seconds with matching style",
    "negative_prompt": "low quality, artifacts",
    "external_task_id": "extend_probe_2"
  },
  "response": {
    "error": "HTTP Error 400: Bad Request",
    "status_code": 400,
    "response_body": "{\"code\":1201,\"message\":\"This video not supported extend-video\",\"request_id\":\"f335be4e-1da2-43d6-a6aa-efce5a2f8d2e\"}",
    "category": "malformed"
  }
}