curl --request GET \
  --url 'https://api.elkapi.com/v1/video/generations/task_abc123' \
  --header 'Authorization: Bearer <token>'

{
  "code": "success",
  "message": "",
  "data": {
    "task_id": "task_abc123",
    "platform": "doubao-video",
    "action": "generate",
    "status": "SUCCESS",
    "progress": "100%",
    "result_url": "https://example.com/video.mp4",
    "created_at": 1760000000,
    "updated_at": 1760000060,
    "data": {
      "id": "upstream_task_id",
      "status": "succeeded",
      "content": {
        "video_url": "https://example.com/video.mp4"
      },
      "usage": {
        "completion_tokens": 123456,
        "total_tokens": 123456
      }
    }
  }
}