curl --request POST \
  --url https://extraction-api.nanonets.com/api/v1/classify/sync \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file' \
  --form 'categories=[{"name": "Invoice", "description": "Bills and invoices"}, {"name": "Contract", "description": "Legal agreements"}]'

{
  "success": true,
  "message": "<string>",
  "result": {
    "filename": "<string>",
    "total_pages": 123,
    "pages": [
      {
        "page_number": 2,
        "category": "<string>",
        "confidence": 50,
        "reasoning": "<string>",
        "identified_category": "<string>"
      }
    ],
    "file_id": "<string>",
    "processing_time": 123,
    "error": "<string>"
  }
}