curl --request GET \
  --url https://api.hubapi.com/integrations/v1/me \
  --header 'Authorization: Bearer <token>'

{
  "portalId": 2519445,
  "timeZone": "America/New_York",
  "currency": "USD",
  "utcOffsetMilliseconds": -18000000,
  "utcOffset": "-05:00"
}