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Because RT::Authen::ExternalAuth runs before core's AttemptPasswordAuthentication, the core "you're logged in!" callback never runs. This means if you want to do something 'on login' you have no hook for RT::Authen::ExternalAuth users. We call the core SuccessfulLogin callback from RT::Authen::ExternalAuth so that your code should 'just work' in both scenarios. The DoAuth $next extraction is virtually identical to core, so should work for normal use cases (RTIR's code works on both core and with this change).