{
  "document_url": "https://example.com/invoice.pdf",
  "schema": {
    "type": "object",
    "properties": {
      "invoice_number": {
        "type": "string"
      },
      "invoice_date": {
        "type": "string"
      },
      "total_amount": {
        "type": "number"
      },
      "vendor_name": {
        "type": "string"
      },
      "line_items": {
        "type": "array",
        "items": {
          "type": "object",
          "properties": {
            "description": {
              "type": "string"
            },
            "quantity": {
              "type": "number"
            },
            "unit_price": {
              "type": "number"
            },
            "total": {
              "type": "number"
            }
          }
        }
      }
    }
  }
}