# InventorySalesApi moduleThe `InventorySalesApi` module provides service contracts for inventory management. This module is part of the new inventory infrastructure. The[Inventory Management overview](https://devdocs.magento.com/guides/v2.3/inventory/index.html)describes the MSI (Multi-Source Inventory) project in more detail.## Installation detailsThis module is installed as part of Magento Open Source. It cannot be deleted or disabled.## ExtensibilityThe `InventorySalesApi` module contains extension points and APIs that 3rd-party developerscan use to provide custom inventory catalog functionality.### Public APIsPublic APIs are defined in the `Api` and `Api/Data` directories.### REST endpointsThe `etc/webapi.xml` file defines endpoints for determining whether a salable amount of products are available for purchase.