---
title: Cart Checkout Validation Function API
description: This API version is not supported.
api_version: 2026-07
source_url:
  html: https://shopify.dev/docs/api/functions/latest/cart-checkout-validation
  md: https://shopify.dev/docs/api/functions/latest/cart-checkout-validation.md
---

# Cart Checkout Validation Function API

The Cart Checkout Validation Function API isn't supported in the latest API version.