---
title: Extension Points
description: A checkout UI extension will register for one or more extension points using `shopify.extend()`. An extension point in a UI extension is a plain JavaScript function. This function receives an API object for interacting with the application, and is expected to return a value in a specific shape. The input arguments and the output type are different for each extension point.
api_version: 2025-10
api_name: checkout-ui-extensions
source_url:
  html: https://shopify.dev/docs/api/checkout-ui-extensions/latest/extension-points-overview
  md: https://shopify.dev/docs/api/checkout-ui-extensions/latest/extension-points-overview.md
---

Extension Points

Not supported in this version.