curl --request GET \
  --url https://api.useaira.com/v1/customers/{id}/subsidiaries \
  --header 'X-API-KEY: <api-key>'

{
  "items": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "externalId": "705faf65-9c8b-4053-8c0b-2021281ce83f",
      "name": "Acme Inc.",
      "type": "individual",
      "invoicePrefix": "ACMEI",
      "parentCustomerId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "archivedAt": "2023-11-07T05:31:56Z",
      "customFields": {
        "customField1": "value1",
        "customField2": [
          "value2",
          "value3"
        ]
      }
    }
  ]
}