curl --request POST \
  --url https://api.kie.ai/api/v1/mj/generateVideoExtend \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "prompt": "继续场景，宇宙飞船加速进入彩色星云，带有动态光迹",
  "taskType": "mj_video_extend_manual",
  "taskId": "ee603959-debb-48d1-98c4-a6d1c717eba6",
  "index": 0,
  "waterMark": "my_watermark",
  "callBackUrl": "https://api.example.com/callback"
}'

{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "40d90dd1c6fddsa0a7dssa2a08366149"
  }
}