calculateDelivery example

    public function __construct(
        private readonly QuantityPriceCalculator $priceCalculator,
        private readonly PercentageTaxRuleBuilder $percentageTaxRuleBuilder
    ) {
    }

    public function calculate(CartDataCollection $data, Cart $cart, DeliveryCollection $deliveries, SalesChannelContext $context): void
    {
        foreach ($deliveries as $delivery) {
            $this->calculateDelivery($data, $cart, $delivery, $context);
        }
    }

    private function calculateDelivery(CartDataCollection $data, Cart $cart, Delivery $delivery, SalesChannelContext $context): void
    {
        $costs = null;
        $manualShippingCost = $cart->getExtension(DeliveryProcessor::MANUAL_SHIPPING_COSTS);
        $manualShippingCost = $manualShippingCost instanceof CalculatedPrice ? $manualShippingCost : null;
        if ($delivery->getShippingCosts()->getUnitPrice() > 0 || $manualShippingCost) {
            $costs = $this->calculateShippingCosts(
                $delivery->getShippingMethod(),