/**
  * Applies Coupon in Cart, and flushes it
  *
  * @param CartCouponOnApplyEvent $event Event
  *
  * @throws CouponRulesNotValidateException Invalid rules
  */
 public function onCartCouponApply(CartCouponOnApplyEvent $event)
 {
     $cart = $event->getCart();
     $coupon = $event->getCoupon();
     if (!$this->cartCouponRuleManager->checkCouponValidity($cart, $coupon)) {
         $this->cartCouponEventDispatcher->dispatchCartCouponOnRejectedEvent($cart, $coupon);
         $event->stopPropagation();
     }
 }