addNoticeToCart example

        $originalShippingMethod = $salesChannelContext->getShippingMethod();
        if (!$this->shippingMethodBlocked($errors)) {
            return $originalShippingMethod;
        }

        $shippingMethod = $this->getShippingMethodToChangeTo($errors, $salesChannelContext);
        if ($shippingMethod === null) {
            return $originalShippingMethod;
        }

        $this->addNoticeToCart($errors, $shippingMethod);

        return $shippingMethod;
    }

    private function shippingMethodBlocked(ErrorCollection $cartErrors): bool
    {
        foreach ($cartErrors as $error) {
            if ($error instanceof ShippingMethodBlockedError) {
                return true;
            }
        }

        

        $originalPaymentMethod = $salesChannelContext->getPaymentMethod();
        if (!$this->paymentMethodBlocked($errors)) {
            return $originalPaymentMethod;
        }

        $paymentMethod = $this->getPaymentMethodToChangeTo($errors, $salesChannelContext);
        if ($paymentMethod === null) {
            return $originalPaymentMethod;
        }

        $this->addNoticeToCart($errors, $paymentMethod);

        return $paymentMethod;
    }

    private function paymentMethodBlocked(ErrorCollection $errors): bool
    {
        foreach ($errors as $error) {
            if ($error instanceof PaymentMethodBlockedError) {
                return true;
            }
        }