---
title: Cart and Checkout Validation Function API - Shopify developer changelog
description: >-
  Shopify’s developer changelog documents all changes to Shopify’s platform.
  Find the latest news and learn about new platform opportunities.
source_url:
  html: 'https://shopify.dev/changelog/cart-and-checkout-validation-function-api'
  md: 'https://shopify.dev/changelog/cart-and-checkout-validation-function-api.md'
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  affectedApi: []
  primaryTag:
    displayName: API
    handle: api
  secondaryTag:
    displayName: New
    handle: new
  indicatesActionRequired: false
  createdAt: '2023-11-30T15:15:51-05:00'
  postedAt: '2024-01-31T14:33:00-05:00'
  updatedAt: '2024-02-02T10:05:19-05:00'
  effectiveAt: '2024-01-31T14:33:00-05:00'
---

January 31, 2024

Tags:

* API

# Cart and Checkout Validation Function API

You can now use Admin UI extensions to provide a user interface for merchants to configure your Cart and Checkout Validation Functions.

Additionally, merchants on any plan can now use validation functions provided by public apps distributed through the Shopify App Store.

Learn more on [Shopify.dev](https://shopify.dev/docs/apps/checkout/validation/create-complex-validation-rules).