/**
  * Selected attribute for currency select.
  *
  * @param $currency
  * @return null|string
  */
 public function selected($currency)
 {
     if (!$this->provider->is($currency)) {
         return null;
     }
     return ' selected="selected"';
 }
 /**
  * CookieProvider constructor.
  *
  * @param Config $config
  * @param Request $request
  */
 public function __construct(Config $config, Request $request)
 {
     parent::__construct($config);
     $this->request = $request;
 }