Example:

    {
  "ExtraFields": {
    "sample string 1": "sample string 2",
    "sample string 3": "sample string 4"
  },
  "BusinessPartnerType": "Customer",
  "EmployeeNumber": "sample string 1",
  "IsPrinted": true,
  "KindFlag": "sample string 2",
  "Number": "sample string 3",
  "WarehouseLocationNumber": "sample string 4",
  "WarehouseNumber": "sample string 5",
  "BusinessPartner": {
    "BusinessPartnerContract": null,
    "BusinessPartnerContractDate": null,
    "BusinessPartnerReferenceNumber": null,
    "Company": null,
    "ContactPersonId": null,
    "FirstName": null,
    "LastName": null,
    "ReferenceAddressNumber": null,
    "Salutation": null,
    "Address": {
      "AdditionalInformation1": null,
      "AdditionalInformation2": null,
      "AdditionalInformation3": null,
      "City": null,
      "CountryId": null,
      "Number": null,
      "Street": null,
      "ZipCode": null
    }
  },
  "CustomFields": {
    "CustomDate1": null,
    "CustomDate2": null,
    "CustomIndicator1": null,
    "CustomIndicator2": null,
    "CustomIndicator3": null,
    "CustomIndicator4": null,
    "CustomNumber1": null,
    "CustomNumber2": null,
    "CustomNumber3": null,
    "CustomNumber4": null,
    "CustomText1": null,
    "CustomText2": null
  },
  "Payment": {
    "CostCenterNumber": null
  }
}