Ideally you wouldn’t be able to do this, the domain would be locked down, but if you create a webhook trigger and then point a HTTP node at it using Predefined Credentials (your OAuth creds) you’ll be able to grab it from the headers.
Hello permontto, but i have only generic credential type. i see only one workaround is create custom api call to create new connection and get access token only via classic https node API Calls, then refresh access token manually. My service allow to create another unique credential.