getPurchaseSteps example

if ($behavior->hasPermission(self::SKIP_PRODUCT_STOCK_VALIDATION)) {
            return;
        }

        $minPurchase = 1;
        $steps = 1;
        $available = $item->getQuantity();

        if ($item->getQuantityInformation() !== null) {
            $minPurchase = $item->getQuantityInformation()->getMinPurchase();
            $available = $item->getQuantityInformation()->getMaxPurchase() ?? 0;
            $steps = $item->getQuantityInformation()->getPurchaseSteps() ?? 1;
        }

        if ($available < $minPurchase) {
            $scope->remove($item->getId());

            $cart->addErrors(
                new ProductOutOfStockError((string) $item->getReferencedId(), (string) $item->getLabel())
            );

            return;
        }

        

        foreach ($quantities as $productId => $quantity) {
            $lineItem = $refs[$productId];
            $quantityInformation = $lineItem->getQuantityInformation();
            if ($quantityInformation === null) {
                continue;
            }

            $minPurchase = $quantityInformation->getMinPurchase();
            $available = $quantityInformation->getMaxPurchase() ?? 0;
            $steps = $quantityInformation->getPurchaseSteps() ?? 1;

            if ($available >= $quantity) {
                continue;
            }

            $maxAvailable = (int) (floor(($available - $minPurchase) / $steps) * $steps + $minPurchase);

            $cart->addErrors(
                new ProductStockReachedError($productId, (string) $lineItem->getLabel(), $maxAvailable, false),
            );
        }
    }

    protected function getMappingData($mainDetail, $mapping)
    {
        $mainData = [];
        if ($mapping['settings']) {
            $mainData['supplierNumber'] = $mainDetail->getSupplierNumber();
            $mainData['weight'] = $mainDetail->getWeight();
            $mainData['stockMin'] = $mainDetail->getStockMin();
            $mainData['ean'] = $mainDetail->getEan();
            $mainData['minPurchase'] = $mainDetail->getMinPurchase();
            $mainData['purchaseSteps'] = $mainDetail->getPurchaseSteps();
            $mainData['maxPurchase'] = $mainDetail->getMaxPurchase();
            $mainData['releaseDate'] = $mainDetail->getReleaseDate();
            $mainData['shippingTime'] = $mainDetail->getShippingTime();
            $mainData['shippingFree'] = $mainDetail->getShippingFree();
            $mainData['width'] = $mainDetail->getWidth();
            $mainData['height'] = $mainDetail->getHeight();
            $mainData['len'] = $mainDetail->getLen();
            $mainData['lastStock'] = $mainDetail->getLastStock();
        }
        if ($mapping['stock']) {
            $mainData['inStock'] = $mainDetail->getInStock();
        }