public function getUsers($perPage = 15)
    {
        $directory = Google::make('directory');
        try {
            $r = $directory->users->listUsers([
                'domain' => config('users.google_apps_domain'),
                'maxResults' => $perPage
            ]);
        } catch (\Exception $e) {
            return json_decode($e->getMessage());
        }

        return $r->users;
    }