public function loadExtraRoutes()
    {
        $config = Config::get('amethyst.invoice.http.admin.invoice');

        if (Arr::get($config, 'enabled')) {
            Router::group('admin', Arr::get($config, 'router'), function ($router) use ($config) {
                $controller = Arr::get($config, 'controller');
                $router->post('/{id}/issue', ['as' => 'issue', 'uses' => $controller.'@issue']);
            });
        }
    }