calculateShippingCosts example

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(),
                new PriceCollection([
                    new Price(
                        Defaults::CURRENCY,
                        $delivery->getShippingCosts()->getTotalPrice(),
                        $delivery->getShippingCosts()->getTotalPrice(),
                        false
                    ),
                ]),
                $delivery->getPositions()->getLineItems(),
                $context,