newsupernova/vendor/magento/module-catalog/etc/extension_attributes.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Api/etc/extension_attributes.xsd">
    <extension_attributes for="Magento\Quote\Api\Data\ProductOptionInterface">
        <attribute code="custom_options" type="Magento\Catalog\Api\Data\CustomOptionInterface[]" />
    </extension_attributes>
    <extension_attributes for="Magento\Catalog\Api\Data\ProductInterface">
        <attribute code="website_ids" type="int[]"/>
    </extension_attributes>
    <extension_attributes for="Magento\Catalog\Api\Data\ProductOptionInterface">
        <attribute code="custom_options" type="Magento\Catalog\Api\Data\CustomOptionInterface[]" />
    </extension_attributes>
    <extension_attributes for="Magento\Catalog\Api\Data\CustomOptionInterface">
        <attribute code="file_info" type="Magento\Framework\Api\Data\ImageContentInterface"/>
    </extension_attributes>
    <extension_attributes for="Magento\Catalog\Api\Data\ProductAttributeMediaGalleryEntryInterface">
        <attribute code="video_content" type="Magento\Framework\Api\Data\VideoContentInterface" />
    </extension_attributes>
    <extension_attributes for="Magento\Catalog\Api\Data\ProductInterface">
        <attribute code="category_links" type="Magento\Catalog\Api\Data\CategoryLinkInterface[]" />
    </extension_attributes>
    <extension_attributes for="Magento\Catalog\Api\Data\ProductTierPriceInterface">
        <attribute code="percentage_value" type="float" />
    </extension_attributes>
    <extension_attributes for="Magento\Catalog\Api\Data\ProductTierPriceInterface">
        <attribute code="website_id" type="int" />
    </extension_attributes>
</config>