integrate_register_after hook not called for admin registration
As the subject says, the integrate_register_after hook is not called if a user is registered using the admin interface. This means that integrations would not be aware of those members being added. Probably not the way it would work.
I think
// If they are for sure registered, let other people to know about it
call_integration_hook('integrate_register_after', array($regOptions, $memberID));
Should also be placed above these lines in registerMember() in Members.subs.php
// All admins are finished here.
return $memberID;
So that the integration function is called whenever a member is registered.