---
title: API versioning and unified UI extensions
description: |
  
  As of Summer Editions 2023 (July 26), we have introduced some important changes to checkout UI extensions:

  - The introduction of API versioning and the [associated API versioning strategy](/docs/api/usage/versioning)
  - Changes to the configuration `toml` file that match the format for other app extensions
  - `extension points` have been renamed to `targets`

  For more details on the above, [please visit our post on the ui-extensions public repository](https://github.com/Shopify/ui-extensions/discussions/1161)
api_version: 2025-10
api_name: checkout-ui-extensions
source_url:
  html: https://shopify.dev/docs/api/checkout-ui-extensions/latest/versioning-migration
  md: https://shopify.dev/docs/api/checkout-ui-extensions/latest/versioning-migration.md
---

API versioning and unified UI extensions

Not supported in this version.