curl --request GET \
  --url https://api.hubapi.com/oauth/v1/access-tokens/{token}

{
  "app_id": 123,
  "expires_in": 123,
  "hub_domain": "<string>",
  "hub_id": 123,
  "is_private_distribution": true,
  "scopes": [
    "<string>"
  ],
  "signed_access_token": {
    "appId": 123,
    "expiresAt": 123,
    "hubId": 123,
    "hublet": "<string>",
    "installingUserId": 123,
    "isPrivateDistribution": true,
    "isServiceAccount": true,
    "isUserLevel": true,
    "newSignature": "<string>",
    "scopeToScopeGroupPks": "<string>",
    "scopes": "<string>",
    "signature": "<string>",
    "trialScopeToScopeGroupPks": "<string>",
    "trialScopes": "<string>",
    "userId": 123
  },
  "token": "<string>",
  "token_type": "<string>",
  "user": "<string>",
  "user_id": 123
}