validateCustomerAddresses example

$page = $this->genericPageLoader->load($request, $context);
        $page = CheckoutConfirmPage::createFrom($page);

        if ($page->getMetaInformation()) {
            $page->getMetaInformation()->setRobots('noindex,follow');
        }

        $page->setPaymentMethods($this->getPaymentMethods($context));
        $page->setShippingMethods($this->getShippingMethods($context));

        $cart = $this->cartService->get($context->getToken(), $context, false, true);
        $this->validateCustomerAddresses($cart, $context);
        $page->setCart($cart);

        $page->setShowRevocation($cart->getLineItems()->hasLineItemWithState(State::IS_DOWNLOAD));
        $page->setHideShippingAddress(!$cart->getLineItems()->hasLineItemWithState(State::IS_PHYSICAL));

        $this->eventDispatcher->dispatch(
            new CheckoutConfirmPageLoadedEvent($page, $context, $request)
        );

        return $page;
    }