> Deprecated:
> Product subscription app extensions won't be supported as of December 3, 2025. You should migrate existing product subscription app extensions to [purchase options extensions](/docs/apps/build/purchase-options/purchase-options-extensions).


Product subscription extensions enable you to add new UI and functionality to the Shopify admin. You build the extensions into your app using Shopify-provided extension points, APIs, and UI components.

Learn how to build a [product subscription app extension](/docs/apps/build/purchase-options/product-subscription-app-extensions).

## In this section

- **[Extension points APIs](/docs/api/product-subscription-extensions/api)**: Learn about the APIs provided to extension points.
- **[Components](/docs/api/product-subscription-extensions/components)**: Learn about the components that you can use to build experiences in the Shopify admin.