{
    "step": null,
    "invoice": {
        "date": {
            "day": "",
            "month": "",
            "year": ""
        },
        "number": "",
        "seller": {
            "name": "",
            "econ_code": "",
            "phone": "",
            "address": ""
        },
        "buyer": {
            "name": "",
            "econ_code": "",
            "phone": "",
            "address": ""
        },
        "tax": "",
        "discount": "",
        "discount_type": "percent",
        "notes": "",
        "items": [
            {
                "desc": "پشم شیشه پوشینگر",
                "qty": 10,
                "unit": "لیتر",
                "price": 1000,
                "total": 10000
            }
        ]
    },
    "new_item": null,
    "screen_message_id": 11746
}