I have successfully linked my home automation platform with Google Assistant through OAuth2. The user signs into our platform via Google Home App and completes OAuth flow. After completing account linking, the Google Assistant makes a request to my fulfillment URL to sync devices with 'action.devices.SYNC' intent.
But there is no authorization token received in any of the requests to my platform from Google Assistant. How can I identify the requesting user? Where can I find the auth token?