{
    "billingNo": "2023-1",
    "receipient": "Herrn Max Mustermann\\\\Dingsstr.\\ 1\\\\12345 Dorf",
    "salutation": "Hallo Max",
    "entries": [
        { "no": 1, "date": "01.01.2023", "description": "Bla1", "count": 2, "unitprice": 110.0 }
    ]
}