OrderCustomer CustomFields über /api/search/order

Shopware 6 (German)
1

Hallo.

Wie muss die payload aussehen um an die CustomFields des OrderCustomers zu gelangen. Aktuelle payload sieht wie folgt aus:
http://localhost/api/search/order

{
  "associations": {
    "addresses": {
      "associations": {
        "country": {}
      }
    },
    "orderCustomer": {
    },
    "lineItems": {
      "associations": {
        "product": {}
      }
    }
  },
  "filter": [{
    "value": "open",
    "field": "order.stateMachineState.technicalName",
    "type": "equals"
  }],
  "limit" : 10,
  "page" : 1,
  "sort": [{
    "field": "orderDateTime",
    "order": "DESC",
    "naturalSorting": true
  }]
}

Gruß Mike