IdStruct example

return $root;
    }

    private static function updateLineItem(LineItem $lineItem, OrderLineItemEntity $entity, string $id): void
    {
        $lineItem->setId($entity->getIdentifier())
            ->setLabel($entity->getLabel())
            ->setGood($entity->getGood())
            ->setRemovable($entity->getRemovable())
            ->setStackable($entity->getStackable())
            ->setStates($entity->getStates())
            ->addExtension(OrderConverter::ORIGINAL_ID, new IdStruct($id));

        if ($entity->getPayload() !== null) {
            $lineItem->setPayload($entity->getPayload());
        }

        if ($entity->getPrice() !== null) {
            $lineItem->setPrice($entity->getPrice());
        }

        if ($entity->getPriceDefinition() !== null) {
            $lineItem->setPriceDefinition($entity->getPriceDefinition());
        }

if ($order->getDeliveries() === null) {
            throw OrderException::missingAssociation('deliveries');
        }

        $cart = new Cart(Uuid::randomHex());
        $cart->setPrice($order->getPrice());
        $cart->setCustomerComment($order->getCustomerComment());
        $cart->setAffiliateCode($order->getAffiliateCode());
        $cart->setCampaignCode($order->getCampaignCode());
        $cart->setSource($order->getSource());
        $cart->addExtension(self::ORIGINAL_ID, new IdStruct($order->getId()));
        $orderNumber = $order->getOrderNumber();
        if ($orderNumber === null) {
            throw OrderException::missingOrderNumber($order->getId());
        }

        $cart->addExtension(self::ORIGINAL_ORDER_NUMBER, new IdStruct($orderNumber));
        /* NEXT-708 support: - transactions */

        $lineItems = LineItemTransformer::transformFlatToNested($order->getLineItems());