# Reconciliation poll > A scheduled job that compares state with the PhotoRobot API to catch missed webhooks. Category: E-commerce and workflow. A reconciliation poll periodically reads the current state from an API and corrects the downstream system. It catches events that a webhook should have delivered but did not. ## How PhotoRobot uses it PhotoRobot Academy recommends it as a safety net even when webhooks are healthy, running every few minutes to nightly. Covered in modules [I02](https://www.photorobot.com/academy/curriculum#i02-webhook-architecture) and [I03](https://www.photorobot.com/academy/curriculum#i03-shooting-list-sku). ## Related terms - [Webhook](https://www.photorobot.com/glossary/webhook): An HTTP request one system sends to another automatically when an event happens. - [Idempotency](https://www.photorobot.com/glossary/idempotency): Processing the same event twice without changing the result. - [PhotoRobot Cloud API](https://www.photorobot.com/glossary/cloud-api): PhotoRobot's REST API for integrating the studio with catalog, DAM, PIM and e-commerce systems.