---
title: Extension API
description: The API for interacting with the metadata of an extension.
api_version: 2026-04
api_name: checkout-ui-extensions
source_url:
  html: https://shopify.dev/docs/api/checkout-ui-extensions/latest/apis/extension-api
  md: https://shopify.dev/docs/api/checkout-ui-extensions/latest/apis/extension-api.md
---

Extension API

Not supported in this version.