validateBillingAddress example

    private function validateCustomerAddresses(Cart $cart, SalesChannelContext $context): void
    {
        $customer = $context->getCustomer();
        if ($customer === null) {
            throw CartException::customerNotLoggedIn();
        }

        $billingAddress = $customer->getActiveBillingAddress();
        $shippingAddress = $customer->getActiveShippingAddress();

        $this->validateBillingAddress($billingAddress, $cart, $context);
        $this->validateShippingAddress($shippingAddress, $billingAddress, $cart, $context);
    }

    private function validateBillingAddress(
        ?CustomerAddressEntity $billingAddress,
        Cart $cart,
        SalesChannelContext $context
    ): void {
        $validation = $this->addressValidationFactory->create($context);
        $validationEvent = new BuildValidationEvent($validation, new DataBag(), $context->getContext());
        $this->eventDispatcher->dispatch($validationEvent);