curl --request GET \
  --url 'https://api.elkapi.com/kling/v1/videos/text2video/task_1234567890' \
  --header 'Authorization: Bearer <token>'

{
  "task_id": "task_1234567890",
  "status": "completed",
  "url": "https://example.com/image.png",
  "format": "mp4",
  "metadata": {
    "duration": 5,
    "fps": 30,
    "width": 1280,
    "height": 720,
    "seed": 12345
  },
  "error": {
    "code": 1,
    "message": "message"
  }
}