# Support added for app-owned metafields — Shopify developer changelog --- ## Support added for app-owned metafields In the `2025-04` API versions of Checkout and Customer Account UI extension APIs, we've enhanced the `appMetafield` API to support reading app owned metafields. These metafields give you greater control over your application's data, as your app manages both the data and its visibility. To read app-owned metafields, you must request them in your extension configuration `toml` file using the `$app` format in the namespace. This configuration makes app-owned metafields accessible through the `appMetafield` API in your UI extension code. Note that while you can read these metafields, writing to them is not permitted. Currently, app-owned metafields are available in the `unstable` version and will be included in stable versions starting from `2025-04`. For more details, please refer to the metafield configuration guide for the [Checkout UI extensions API](https://shopify.dev/docs/api/checkout-ui-extensions/unstable/apis/metafields) or the [Customer Account UI extensions API](https://shopify.dev/docs/api/customer-account-ui-extensions/unstable/configuration#metafields). *Published: February 07, 2025* Tags: API, New Link: https://shopify.dev/changelog/support-added-for-app-owned-metafields-in-checkout-ui-extension-api ---