Glossary/Retail Media & Commerce/Shopify Checkout Extensibility
Retail Media & Commerce
Shopify Checkout Extensibility
Shopify's app-based framework for customizing checkout, using UI extensions, Shopify Functions, and web pixels instead of the retired checkout.liquid.
By Brandon Mina·CEO, BrandPilot AI·Updated November 2026
Short answer
Shopify Checkout Extensibility is Shopify's app-based framework for customizing the checkout experience. It uses checkout UI extensions, Shopify Functions, and web pixels instead of the retired checkout.liquid file. The approach lets merchants add features and tracking in a way that is more secure, upgrade-safe, and compatible with Shopify's accelerated checkouts.