curl --request GET \
  --url https://sandbox.tight.com/v6/customers/{id} \
  --header 'Authorization: Bearer <token>'

{
  "result": "SUCCESS",
  "data": {
    "id": "cus_28868401",
    "name": "Acme Corp",
    "status": "ACTIVE",
    "additionalContactName": "Jane Smith",
    "businessName": "Acme Corporation LLC",
    "email": "billing@acme.com",
    "ccEmails": [
      "cc@acme.com"
    ],
    "bccEmails": [
      "bcc@acme.com"
    ],
    "invoiceSettings": {
      "invoicePrefix": "INV-",
      "showAdditionalContactName": true,
      "showBusinessName": true,
      "showName": true,
      "showEmail": true,
      "showAddress": true,
      "showPhoneWork": true
    },
    "address": {
      "countryCode": "USA",
      "state": "<string>",
      "city": "<string>",
      "zip": "<string>",
      "phoneWork": "<string>",
      "address1": "<string>",
      "address2": "<string>"
    },
    "classSegments": [
      {
        "id": "cls_593051",
        "label": {
          "id": "cll_4521",
          "name": "Region",
          "requiredness": "NOT_REQUIRED"
        },
        "name": "Mid-Atlantic",
        "child": {
          "id": "cls_593052",
          "label": {
            "id": "cll_4521",
            "name": "Region",
            "requiredness": "NOT_REQUIRED"
          },
          "name": "Washington DC",
          "child": "<unknown>"
        }
      }
    ],
    "createdDateTime": "2023-11-07T05:31:56Z",
    "customData": {
      "internal_key": "some_internal_key",
      "some_other_field": 23434
    }
  }
}