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Async media tasks can include a callback URL when enabled for the API key or request. Callbacks are retried by the platform when delivery fails. 
{
  "task_id": "task_123",
  "status": "completed",
  "model": "seedance-2.0",
  "result": {
    "type": "video",
    "urls": ["https://.../video.mp4"]
  }
}

​
Recommendation

Always verify task status through /v1/tasks/{task_id} before treating a webhook as final in high-value workflows.