newsupernova/vendor/magento/module-inventory-catalog-api/etc/webapi.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Webapi:etc/webapi.xsd">
    <route url="/V1/inventory/bulk-product-source-assign" method="POST">
        <service class="Magento\InventoryCatalogApi\Api\BulkSourceAssignInterface" method="execute"/>
        <resources>
            <resource ref="Magento_Catalog::products"/>
        </resources>
    </route>
    <route url="/V1/inventory/bulk-product-source-unassign" method="POST">
        <service class="Magento\InventoryCatalogApi\Api\BulkSourceUnassignInterface" method="execute"/>
        <resources>
            <resource ref="Magento_Catalog::products"/>
        </resources>
    </route>
    <route url="/V1/inventory/bulk-product-source-transfer" method="POST">
        <service class="Magento\InventoryCatalogApi\Api\BulkInventoryTransferInterface" method="execute"/>
        <resources>
            <resource ref="Magento_Catalog::products"/>
        </resources>
    </route>
</routes>