Document

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            "item_net_price": "string",
            "item_taxrate": "string"
        }
    ],
    "partner": {
        "name": "string",
        "partner_type": "string",
        "country": "string",
        "tax_id": null,
        "zip": "string",
        "city": "string",
        "address": "string",
        "email": null
    },
    "nav_data": null,
    "notes": null,
    "extra_data": {
        "payment_method": "string",
        "sendmail": true,
        "tax_total_HUF": 0
    },
    "currency": "string",
    "nav_transactionId": null,
    "net_total_HUF": "string"
}