{
  "endpoint_type": "extend",
  "payload": {
    "video_id": "866884886932627484",
    "prompt": "Continue naturally for a few more seconds with matching style",
    "negative_prompt": "low quality, artifacts",
    "external_task_id": "extend_probe_4"
  },
  "response": {
    "error": "HTTP Error 400: Bad Request",
    "status_code": 400,
    "response_body": "{\"code\":1201,\"message\":\"This video not supported extend-video\",\"request_id\":\"cc4dff40-5d62-4d4d-bcec-0284c27a9f5c\"}",
    "category": "malformed"
  }
}