curl --request GET \
  --url https://api.hubapi.com/account-info/v3/details \
  --header 'Authorization: Bearer <token>'

{
  "additionalCurrencies": [
    "NZD",
    "AUD",
    "EUR"
  ],
  "companyCurrency": "USD",
  "dataHostingLocation": "eu1",
  "portalId": 12345678,
  "timeZone": "US/Eastern",
  "uiDomain": "app-eu1.hubspot.com",
  "utcOffset": "-04:00",
  "utcOffsetMilliseconds": -14400000
}