checkPrice example

$orderPosition = null;
        foreach ($order->getDetails() as $position) {
            if ($position->getId() === (int) $data['id']) {
                $orderPosition = $position;
                break;
            }
        }
        // Only get graduated price if a new position should be added or quantity has changed         if (($orderPosition === null || $orderPosition->getQuantity() !== (int) $data['quantity'])
            && $this->hasProductGraduatedPrices($data['articleNumber'], $order)
        ) {
            $data = $this->checkPrice($data, $order, $shopContext);
        }

        $variant = $this->getManager()->getRepository(ProductVariant::class)
            ->findOneBy(['number' => $data['articleNumber']]);

        // Load ean, unit and pack unit (translate if needed)         if ($variant instanceof ProductVariant) {
            $mainVariant = $variant->getArticle()->getMainDetail();
            $data['ean'] = $variant->getEan();
            if (!\is_string($data['ean']) && $mainVariant instanceof ProductVariant) {
                $data['ean'] = $mainVariant->getEan();
            }