# Status round-trip > Sending an item's status from PhotoRobot back to the upstream ERP through a webhook. Also known as: round-trip. Category: E-commerce and workflow. A status round-trip keeps two systems in agreement: when PhotoRobot publishes an item, a webhook handler finds the item's external ID and updates the record in the ERP. It closes the loop between capture and the system of record. ## How PhotoRobot uses it It is the bidirectional sync pattern taught in module [I03](https://www.photorobot.com/academy/curriculum#i03-shooting-list-sku), built on the [external ID](https://www.photorobot.com/glossary/external-id) and the [mapping table](https://www.photorobot.com/glossary/mapping-table). ## Related terms - [External ID](https://www.photorobot.com/glossary/external-id): The customer's own product identifier stored with a PhotoRobot item, for syncing status back. - [Webhook](https://www.photorobot.com/glossary/webhook): An HTTP request one system sends to another automatically when an event happens. - [Item status](https://www.photorobot.com/glossary/item-status): The production state of an item in PhotoRobot Controls, such as Received, Captured, Edited or Published. - [ERP (enterprise resource planning)](https://www.photorobot.com/glossary/erp): Business software that manages core processes such as inventory, orders and finance.