Disconnect

Google's developer policies also require you to provide the ability for a user to disconnect your application from their account. This means your app must provide a way to delete the association between your app and their account. By adding this capability to your app, you can respond to the event and trigger any appropriate logic such as deleting any information you have stored about the user.

GoogleIdentity.service.addEventListener( GoogleIdentityEvent.DISCONNECT, disconnectHandler );

GoogleIdentity.service.disconnect();

private function disconnectHandler( event:GoogleIdentityEvent ):void
{
    trace( event.type );
}