How to track the Shopify Extensibility Checkout

Get data on why customers are abandoning their Shopify basket by using an officially integrated app

Shopify has been gradually introducing their Extensibility checkout format to replace the previous checkout.liquid method of customising their payment forms. Checkout.liquid will be officially deprecated in August 2025 meaning that Extensibility will be the only way to introduce any element of customisation into Shopify stores. It also means that a lot of third party tracking and javascript custom functionality will no longer be available, so store owners need to look elsewhere if they want to get insight into user checkout behaviour.

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What is Shopify’s Checkout Extensibility?

Shopify’s Checkout Extensibility is the platform’s new framework for customising the checkout experience, replacing the legacy checkout.liquid system. Originally designed for Shopify Plus merchants, it introduces a structured approach using Checkout UI Extensions, Shopify Functions, and the Branding API instead of direct code modifications.

The shift to Checkout Extensibility was driven by security, performance, and long-term maintainability. Unlike checkout.liquid, which allowed unrestricted JavaScript and HTML edits, this system operates within Shopify’s controlled environment, ensuring stability across platform updates. However, this also means that deep checkout customisations such as multi-step flows or dynamic UI changes are more restricted and must be implemented through Shopify’s approved methods.

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What does this mean for checkout tracking?

The removal of checkout.liquid means that options for understanding behaviour on Shopify checkouts have been decimated. Previously reliable tools that could have been installed via liquid or a google tag manager integration no longer work.

For example, the ability of UX tracking tool Mouseflow to do anything on the checkout has been completely removed, as they acknowledge here:

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Even big names like Hotjar have been affected - they can’t give you any insight on checkouts any more:

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Is there any way to track Extensibility checkouts?

The good news is that you can still get insights on Shopify checkout behaviour that will help you improve conversion rates. Zuko has been working with Shopify to develop an approved app that is simple to install and will give you meaningful tracking data immediately.

The app is listed within the Shopify store and you can read full instructions on how to install it in the Zuko guide.

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What can you learn with the Zuko app?

The Zuko app gives you valuable information on how people are behaving on your checkout and will shed light on why they are abandoning the journey rather than completing their purchase.

Zuko form analytics was designed to deliver the most in-depth insight into online forms & checkouts so you run deep analysis if you want to, but to give you an idea of the power, we’ve summarised some of the topline reports here:

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See over time how many people reach your checkout, start the form and, ultimately, whether they complete or abandon it

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Understand how far in the checkout journey your customers get. Do they start the form? If they do, do they make it to the submit button or do they drop out before? If they try to submit, is it successful? If not, do they manage to complete later or do they simply drop out?

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Data on individual checkout fields to understand where the biggest points of friction are - where do they have to keep returning to and where do they drop off?

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What happens after a failed submission? Which issue do people jump back to and try to fix before they leave in frustration?

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If you want more information about any of this, or would like to understand more about how Zuko can help you improve your eCommerce checkout,  feel free to contact us at support@zuko.io

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Integrate the Zuko app into your Shopify store for free here

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