{
  "endpoint_type": "extend",
  "payload": {
    "prompt": "Continue the same scene naturally. The woman walks forward a little, shifts her posture, turns slightly toward the camera, raises one hand in a small friendly gesture, and smiles naturally. Soft cinematic lighting, realistic facial expression, natural body movement, clean composition.",
    "negative_prompt": "",
    "video_id": "867459461958090806",
    "external_task_id": "extend-subject2-pro-1774879759"
  },
  "response": {
    "error": "HTTP Error 400: Bad Request",
    "status_code": 400,
    "response_body": "{\"code\":1201,\"message\":\"This video not supported extend-video\",\"request_id\":\"4f14f240-bcee-44ae-a909-2043ec417aea\"}",
    "category": "malformed"
  }
}