installments

{
    "contact": {
        "id": "string",
        "taxId": "string",
        "otherTaxIds": [
            "string"
        ],
        "address": "string",
        "archived": true,
        "cities": "string",
        "contactPeoples": [
            {
                "id": "string",
                "name": "string",
                "phone": "string",
                "email": "string",
                "info": "string",
                "others": [
                    "string"
                ]
            }
        ],
        "countries": "string",
        "countriesCode": "string",
        "default": true,
        "employees": true,
        "employeesInfo": {
            "photo": null,
            "repeat": true
        },
        "ibans": [
            "string"
        ],
        "isCustomer": true,
        "isOim": true,
        "labels": [
            "string"
        ],
        "name": "string",
        "person": true,
        "states": "string",
        "variables": [
            {
                "key": "string",
                "value": "string"
            }
        ],
        "groups": "string",
        "summary": 0,
        "balance": {
            "receivable": 0,
            "debt": 0,
            "payment": 0,
            "paid": 0,
            "sale": 0,
            "purchase": 0
        }
    },
    "startDate": "2019-08-24",
    "endDate": "2019-08-24",
    "definition": "string",
    "repeatCount": 2,
    "startingCount": 1,
    "productName": "string",
    "description": "string",
    "contractNo": "string",
    "vatRate": "string",
    "amount": 0,
    "variables": [
        "string"
    ]
}