We are using the refresh token to get Google Calendar free/busy events. When our application connects with Google account of a user for the first time, we obtain a "Refresh Token" and store that in our database and use that for fetching free/busy events from Google. Things were working fine but now the problem is that whenever a user changes its Gmail password then we're unable to call the Google Api using the stored refresh token. The reason we've have found is that Google revokes the Api access for all applications associated to that account on password change/reset. In our application, calendar is still connected to Google (because we do not make call to reconnect with google again). How can we check/identify if the stored Refresh token is still valid or not? Is there any suggested workaround for this problem?
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