curl --request POST \
  --url https://api.example.com/api/v1/thumbnails/generate \
  --header 'Content-Type: multipart/form-data' \
  --form 'file=<string>' \
  --form 'url=<string>' \
  --form 'url_headers=<string>' \
  --form width=600 \
  --form height=400 \
  --form quality=95 \
  --form sync=true \
  --form 'webhook_url=<string>' \
  --form response_type=url

{
  "job_id": "job_abc123",
  "metadata": {
    "created_at": "2024-01-15T10:30:00Z",
    "file_category": "pdf",
    "file_size": 102400,
    "file_type": "pdf",
    "mime_type": "application/pdf",
    "original_filename": "document.pdf",
    "thumbnail_height": 400,
    "thumbnail_width": 600
  },
  "status": "completed",
  "success": true,
  "thumbnail_url": "https://storage.example.com/thumbnails/thumb_abc123.jpg"
}