getMarkAsTopseller example

$purchasePricesCollection = $product->getPurchasePrices();
        if ($purchasePricesCollection !== null) {
            $purchasePrices = $purchasePricesCollection->getCurrencyPrice(Defaults::CURRENCY);
        }

        $payload = [
            'isCloseout' => $product->getIsCloseout(),
            'customFields' => $product->getCustomFields(),
            'createdAt' => $product->getCreatedAt() ? $product->getCreatedAt()->format(Defaults::STORAGE_DATE_TIME_FORMAT) : null,
            'releaseDate' => $product->getReleaseDate() ? $product->getReleaseDate()->format(Defaults::STORAGE_DATE_TIME_FORMAT) : null,
            'isNew' => $product->isNew(),
            'markAsTopseller' => $product->getMarkAsTopseller(),
            'purchasePrices' => $purchasePrices ? json_encode($purchasePrices, \JSON_THROW_ON_ERROR) : null,
            'productNumber' => $product->getProductNumber(),
            'manufacturerId' => $product->getManufacturerId(),
            'taxId' => $product->getTaxId(),
            'tagIds' => $product->getTagIds(),
            'categoryIds' => $product->getCategoryTree(),
            'propertyIds' => $product->getPropertyIds(),
            'optionIds' => $product->getOptionIds(),
            'options' => $product->getVariation(),
            'streamIds' => $product->getStreamIds(),
            'parentId' => $product->getParentId(),