public function all(Request $request)
    {
        $this->authorize('list-google-apps-users');

        $perPage = config('users.google_apps_users_per_page' , 15);
        if ($request->has('perPage')) {
            $perPage = $request->input('perPage');
        }

        $users = $this->service->getUsers($perPage);

        return $this->paginate($users, $perPage);
    }