{
    "invoices_data":
    [
        {
            "date": "2020-01-01T00:00:00.0000000Z",
            "invoices":[
                {
                    "date":"2020-01-12T00:00:00.0000000Z",
                    "invoiceItems":[
                       {
                          "brutto":200
                       },
                       {
                          "brutto":100
                       },
                       {
                          "brutto":300
                       }
                    ]
                 },
                 {
                   "date":"2020-01-24T00:00:00.0000000Z",
                   "invoiceItems":[
                      {
                         "brutto":200
                      },
                      {
                         "brutto":100
                      }
                   ]
                }
            ]
        },
        {
            "date": "2020-02-01T00:00:00.0000000Z",
            "invoices": [
                {
                    "date":"2020-02-12T00:00:00.0000000Z",
                    "invoiceItems":[
                       {
                          "brutto":200
                       },
                       {
                          "brutto":300
                       }
                    ]
                }
            ]
        },
        {
            "date": "2020-03-01T00:00:00.0000000Z",
            "invoices":[]
        },
        {
            "date": "2020-04-01T00:00:00.0000000Z",
            "invoices":[
                {
                    "date":"2020-04-12T00:00:00.0000000Z",
                    "invoiceItems":[
                       {
                          "brutto":100
                       },
                       {
                          "brutto":300
                       }
                    ]
                 }
            ]
        },
        {
            "date": "2020-05-01T00:00:00.0000000Z",
            "invoices":[
                {
                    "date":"2020-05-12T00:00:00.0000000Z",
                    "invoiceItems":[
                       {
                          "brutto":200
                       },
                       {
                          "brutto":100
                       }
                    ]
                }
            ]
        },
        {
            "date": "2020-06-01T00:00:00.0000000Z",
            "invoices":[
                {
                    "date":"2020-06-12T00:00:00.0000000Z",
                    "invoiceItems":[
                       {
                          "brutto":200
                       },
                       {
                          "brutto":100
                       },
                       {
                          "brutto":300
                       }
                    ]
                }
            ]
        },
        {
            "date": "2020-07-01T00:00:00.0000000Z",
            "invoices":[
                {
                    "date":"2020-07-12T00:00:00.0000000Z",
                    "invoiceItems":[
                       {
                          "brutto":200
                       },
                       {
                          "brutto":300
                       }
                    ]
                }
            ]
        },
        {
            "date": "2020-08-01T00:00:00.0000000Z",
            "invoices":[
                {
                    "date":"2020-08-12T00:00:00.0000000Z",
                    "invoiceItems":[
                       {
                          "brutto":200
                       }
                    ]
                }
            ]
        },
        {
            "date": "2020-09-01T00:00:00.0000000Z",
            "invoices":[
                {
                    "date":"2020-09-09T00:00:00.0000000Z",
                    "invoiceItems":[
                       {
                          "brutto":200
                       },
                       {
                          "brutto":100
                       }
                    ]
                }
            ]
        },
        {
            "date": "2020-10-01T00:00:00.0000000Z",
            "invoices":[
                {
                    "date":"2020-10-12T00:00:00.0000000Z",
                    "invoiceItems":[
                       {
                          "brutto":200
                       },
                       {
                          "brutto":100
                       }
                    ]
                }
            ]
        },
        {
            "date": "2020-11-01T00:00:00.0000000Z",
            "invoices":[
                {
                    "date":"2020-11-12T00:00:00.0000000Z",
                    "invoiceItems":[
                       {
                          "brutto":100
                       },
                       {
                          "brutto":300
                       }
                    ]
                }
            ]
        },
        {
            "date": "2020-12-01T00:00:00.0000000Z",
            "invoices":[]
        }
    ]
 }