The Square Inventory Webhooks API allows you to build real-time notifications for all relevant inventory items and events. It sends a notification when the quantity is updated for a catalog item variation. The Inventory API provides a way to manage inventory counts and integrate with 3rd party tracking software, to accept inventory adjustments and physical counts for quantities of item variations and transitions. Square enables developers to build customized solutions that accept payments online, in-person, or in-app to manage products and customers. Square also builds services that support products and tools to manage finances.