---
title: >-
  Cart and Checkout Validation Function are now available for custom apps -
  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-are-now-available-for-custom-apps
  md: >-
    https://shopify.dev/changelog/cart-and-checkout-validation-function-are-now-available-for-custom-apps.md
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  affectedApi: []
  primaryTag:
    displayName: API
    handle: api
  secondaryTag:
    displayName: Update
    handle: update
  indicatesActionRequired: false
  createdAt: '2023-07-25T12:06:48-04:00'
  postedAt: '2023-07-26T07:00:00-04:00'
  updatedAt: '2024-02-02T10:05:15-05:00'
  effectiveAt: '2023-07-26T07:00:00-04:00'
---

July 26, 2023

Tags:

* API

# Cart and Checkout Validation Function are now available for custom apps

The Shopify Functions API for cart and checkout validations is now available on production stores for custom apps.

Learn more about building cart and checkout validations in our dev docs: [Cart and Checkout validations](https://shopify.dev/api/functions/reference/cart-checkout-validation)