ShoppingCart::curr PHP Method

    public static function curr()
    {
        return self::singleton()->current();
    }

 protected function checkoutconfig()
 {
     $config = new CheckoutComponentConfig(ShoppingCart::curr(), true);
     $config->addComponent($comp = new CouponCheckoutComponent());
     $comp->setValidWhenBlank(true);
     return $config;
 }