{
  "document_type": "verbatim-string",
  "vendor": {
    "name": "verbatim-string",
    "address": "verbatim-string",
    "email": "email-address",
    "phone": "phone-number"
  },
  "invoice_number": "verbatim-string",
  "invoice_date": "verbatim-string",
  "line_items": [
    {
      "description": "verbatim-string",
      "category": ["product", "service", "shipping", "tax", "other"],
      "quantity": "integer",
      "unit_price": "number",
      "unit": "unit-code",
      "amount": "number"
    }
  ],
  "subtotal": "number",
  "tax": "number",
  "total": "number",
  "currency": "currency"
}