Introduction

In e-commerce, the checkout process is one of the most critical parts of the customer journey.

A smooth, secure, and personalized checkout experience can greatly impact conversions and customer satisfaction.

Shopify the e-commerce leader has introduced Shopify Checkout Extensibility a new way to enhance and customize the checkout experience for merchants.

This new model replaces the old checkout. liquid way of doing things, it’s more efficient, secure and flexible to customize the post-cart experience.

To understand the importance of Checkout Extensibility let’s break down a Shopify store into two main parts:

– Pre-Cart: Home, Collection, Product, Cart pages.
– Post-Cart: Checkout, Thank You, Order Status pages.

Shopify Checkout Extensibility is focused on the post-cart experience, allowing merchants to customize and optimize the Checkout, Thank You, and Order Status pages like never before.

What is checkout extensibility?

Shopify Checkout Extensibility is the newest approach, a more efficient and secure way to enhance and customize shopify checkout over a traditional checkout.liquid (depreciated) way.

It provides more flexibility and personalization for checkout customization.

You can add several features and functionalities with the set of extensibility tools and API.

Key Features of Shopify Checkout Extensibility

By upgrading through checkout extensibility, You have doors to open to implement new features and enhance user experience.

Checkout Branding

With the branding API and customization, you can apply your brand’s consistent styling to checkout, so it looks and feels identical from the home page to checkout.

Here is the checkout branding example:

Checkout UI Extension

The Checkout UI extension allows you to enhance the checkout process by adding various sections or blocks, such as upsell, Delivery date, Custom banners, etc.

Each brand experience is unique and different. To maintain it, you may need to customize it accordingly.

The Checkout UI extension allows developers to build such custom functionalities.

Here is how it looks when you implement any checkout UI extension:

Shopify Functions

Functions allow developers to customize the backend logic of the shopify store. It is a more advanced way to make some changes in backend logic before it serves a storefront. For example, the New discount type

Here is a visual representation of how the shopify function works

Developers have to create a function and deploy an app in which merchants can install the app on their shopify store and configure the function.

Checkout Blocks (Free App): Simplify Your Checkout Customizations

Checkout Blocks is a great starting point if you’re looking for an easy-to-use app to customize specific elements of your Shopify checkout.

This app allows merchants to add predefined blocks like custom fields, banners, or messages to checkout.

It’s ideal for those who want basic customization without the need for extensive coding or development work.

However, for merchants who require advanced customizations—like dynamic upsells, custom discount types, or backend logic modifications—implementing Checkout UI Extensions or Shopify Functions offers significantly more flexibility and scalability.

“Thank you” and the “Order Status” page Upgrade

The deadline for Upgrading the Thank you and Order status page is before August 28, 2025.

You might run some third-party API, APPs, or custom scripts on these pages.

Upgrading requires an expert audit to ensure a smooth transition. Contact us today for a free shopify store audit, Advanced customization, and upgrade without breaking.

Conclusion

Checkout extensibility is a new, modern, and flexible way to enhance the checkout experience for your customers. Find a way to upgrade it using checkout branding, UI extensions, OR shopify functions. Also, remember to make sure you got all the required things upgraded for the thank you and order status page.

FAQS

Why is checkout.liquid being deprecated?

Shopify deprecated checkout.liquid to offer a more secure, streamlined, and flexible approach to checkout customization. The new extensibility model ensures faster performance, better integrations, and ongoing platform updates.

Can I use Checkout Extensibility without a Shopify Plus plan?

No, Shopify Checkout Extensibility is exclusively available for Shopify Plus merchants. If you’re not on a Plus plan, you won’t have access to these advanced checkout customization features.

Can I still use custom scripts on the Thank You or Order Status pages?

You can run third-party APIs, apps, or custom scripts on these pages. However, Shopify recommends upgrading and auditing your setup before the August 28, 2025, deadline to ensure compatibility and performance.

Do I need a developer to implement Checkout Extensibility?

While non-technical users may configure features such as branding, advanced customizations like Shopify Functions and Checkout UI Extensions often require developers’ expertise.

How does the Checkout Blocks app compare to Shopify Checkout UI Extensions?

Checkout Blocks is a user-friendly app that enables merchants to add predefined blocks to their checkout process. While it’s an excellent solution for essential modifications, it has limitations compared to Shopify’s Checkout UI Extensions.