allowBuyInListing example

$product->addAttribute('marketing', $this->marketingService->getProductAttribute($product));

            $this->priceCalculationService->calculateProduct($product, $context);

            if (!$this->isProductValid($product, $context)) {
                continue;
            }

            $product->setListingPrice($product->getCheapestUnitPrice());
            $product->setDisplayFromPrice(\count($product->getPrices()) > 1 || $product->hasDifferentPrices());
            $product->setAllowBuyInListing($this->allowBuyInListing($product));
            if ($this->config->get('calculateCheapestPriceWithMinPurchase') && $product->getCheapestPrice() instanceof Price) {
                $product->setListingPrice($product->getCheapestPrice());
            }
            $result[$number] = $product;
        }

        return $result;
    }

    /** * Checks if the provided product is allowed to display in the store front for * the provided context. */

            'sVariantArticle' => null,
            'sConfigurator' => $product->hasConfigurator(),
            // Only used for full products             'metaTitle' => $product->getMetaTitle(),
            'shippingfree' => $product->isShippingFree(),
            'suppliernumber' => $product->getManufacturerNumber(),
            'notification' => $product->allowsNotification(),
            'ean' => trim((string) $product->getEan()),
            'keywords' => $product->getKeywords(),
            'template' => $product->getTemplate(),
            'attributes' => $product->getAttributes(),
            'allowBuyInListing' => $product->allowBuyInListing(),
        ];

        if ($product->hasAttribute('core')) {
            $attributes = $product->getAttribute('core')->toArray();
            unset($attributes['id'], $attributes['articleID'], $attributes['articledetailsID']);

            $data = array_merge($data, $attributes);
        }

        if ($product->getManufacturer()) {
            $manufacturer = [