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Ecomzier rebuilds Shopify checkout customizations on Checkout Extensibility and replaces Shopify Scripts with Shopify Functions. checkout.liquid no longer runs on any checkout page and Scripts stopped running on June 30, 2026, so we audit what your checkout lost, rebuild it with extensions, Functions and pixels, and test every change before it goes live.
No. The deadlines have passed. If your store relied on checkout.liquid, additional scripts or Shopify Scripts and nobody rebuilt them, those customizations are already gone. These are the dates, from Shopify's own documentation:
| Date | What changed | Source |
|---|---|---|
| August 13, 2024 | checkout.liquid stopped working on the Information, Shipping and Payment pages. Shopify said checkouts not upgraded in time would move to an uncustomized, out of the box Shopify Checkout. | Shopify changelog |
| August 28, 2025 | checkout.liquid and additional scripts were sunset on the Thank you and Order status pages, and script tags on those pages were sunset for Plus stores. | Shopify dev docs |
| August 28, 2025 | The additional scripts box in Checkout settings became view only. It can no longer be edited. | Shopify Help Center |
| April 15, 2026 | Editing and publishing Shopify Scripts was no longer possible. | Shopify dev changelog |
| June 30, 2026 | Shopify Scripts was deprecated. Scripts still published were deactivated and no longer work. | Shopify Help Center |
| August 26, 2026 | Deadline for non Plus stores to upgrade their Thank you and Order status pages. Script tags on those pages are sunset for non Plus stores. | Shopify Help Center |
Dates checked against Shopify sources in October 2026.
Checkout Extensibility is how Shopify checkout is customized now. Instead of editing one checkout.liquid file, changes are delivered as apps and settings that Shopify keeps working when it updates checkout. It has four parts:
See Shopify's overview of apps in checkout.
Your checkout.liquid changes, additional scripts or Shopify Scripts stopped working and something is missing: a discount, a shipping rule, a trust message, a tracking tag.
You switched to the default checkout to meet a deadline and planned to rebuild later. We pick up the list and rebuild what still matters.
On Basic, Grow and Advanced you can customize the Thank you and Order status pages with apps, use the checkout editor and move tracking to pixels. We set that up properly.
Standard checkout customization is available on the Basic plan or higher. Customizing the steps where buyers enter their details, and the Checkout Branding API, are Shopify Plus only (Shopify Help Center).
| Customization | Basic, Grow and Advanced | Shopify Plus |
|---|---|---|
| Checkout and accounts editor | Yes | Yes |
| Standard branding: logo, colors, fonts, background | Yes | Yes |
| Apps and blocks on the Thank you and Order status pages | Yes | Yes |
| Apps and UI extensions on the Information, Shipping and Payment steps | No | Yes |
| Checkout Branding API for deeper styling | No | Yes |
| Public App Store apps that use Shopify Functions | Yes | Yes |
| Custom apps with your own Shopify Functions | No | Yes |
| Pixels in Customer events for tracking | Yes | Yes |
Logo, colors, fonts, backgrounds and layout configured in the checkout and accounts editor, matched to your storefront.
Custom content and fields in checkout on Plus: delivery notes, gift messages, trust badges, upsells and B2B fields such as PO numbers.
Tracking moved from additional scripts and script tags to app pixels and custom pixels, with purchase events checked against real orders.
Styling beyond the editor on Plus, such as corner radius, section styling and custom header and footer content.
Discount, delivery, payment and validation logic that replaces Shopify Scripts and checkout.liquid JavaScript rules.
Post purchase content on every plan: surveys, upsells, delivery details and support links, built as app blocks.
Shopify Scripts came in three types: line item, shipping and payment scripts (Shopify Help Center). Each one has a Shopify Function API that replaces it (Function APIs). Shopify's Scripts customizations report, under Apps, Script Editor, lists the Scripts that were active before the deprecation and can be exported as a CSV (Shopify Help Center).
| Shopify Script | What it did | Shopify Function replacement |
|---|---|---|
| Line item scripts | Percentage and fixed discounts, BOGO, tiered and volume price breaks, discounts by product tag. | Discount Function API: one function can discount cart lines, the order subtotal and shipping. Bundles use the Cart Transform Function API. |
| Shipping scripts | Rename, hide or reorder shipping options, change shipping prices. | Delivery Customization Function API to rename, sort and hide delivery options. Shipping price discounts use the Discount Function API. |
| Payment scripts | Rename, hide or reorder payment gateways. | Payment Customization Function API to rename, reorder and hide payment methods, set payment terms and add a review requirement. |
| Checkout rules in checkout.liquid | JavaScript that blocked orders, such as quantity limits or address checks. | Cart and Checkout Validation Function API, which runs on the server and cannot be bypassed in the browser. |
Shopify says Functions execute in under 5 milliseconds (Shopify Help Center). Any plan can use App Store apps built on Functions; custom apps that contain Functions need Shopify Plus (Shopify dev docs).
Tracking that lived in the additional scripts box or in script tags now belongs in pixels, managed under Customer events in your Shopify admin. Pixels run on the online store, customer accounts pages and checkout (Shopify Help Center). Our approach:
Five steps, the same for a single missing discount or a full checkout rebuild.
We review the checkout customizations report under Settings, Checkout (Shopify changelog), the Scripts customizations report, your theme, apps and old checkout.liquid code.
Every customization gets a target: built in setting, App Store app, checkout UI extension, Shopify Function or pixel. Ones you no longer need are dropped.
We build extensions and Functions in a custom app or configure apps, then set up branding in a draft checkout configuration.
Test orders cover discounts, shipping, payment methods, markets, B2B buyers and tracking, on desktop and mobile.
The draft configuration goes live, old scripts are deactivated and we watch orders and analytics in the first days.
It depends on how many customizations you had and how many need custom code. Typical ranges:
| Scope | Typical timeline |
|---|---|
| Audit and mapping | 3 to 5 business days |
| Branding, editor setup and pixel tracking | 1 to 2 weeks |
| Thank you and Order status pages with apps | 1 to 2 weeks |
| Custom checkout UI extensions | 2 to 4 weeks |
| Shopify Functions replacing Scripts | 2 to 6 weeks |
Ranges are typical for planning only, not a quote or a guarantee. Work streams can run in parallel, and the audit sets your actual schedule.
No. checkout.liquid stopped working on the Information, Shipping and Payment pages on August 13, 2024, and was sunset on the Thank you and Order status pages on August 28, 2025 (Shopify dev docs). All checkout customization now runs on Checkout Extensibility.
No. Shopify Scripts was deprecated on June 30, 2026, and any Scripts still published were deactivated (Shopify Help Center). Editing and publishing had already stopped on April 15, 2026 (Shopify dev changelog). The replacement is Shopify Functions.
Usually yes. Shopify's customizations reports list what was active, and most changes can be rebuilt with checkout UI extensions, Functions, branding or pixels. On non Plus plans, only the Thank you and Order status pages accept app customizations (Shopify Help Center).
Only for the Information, Shipping and Payment steps and the Checkout Branding API. Every plan from Basic up gets the checkout editor and apps on the Thank you and Order status pages (Shopify Help Center). See our Shopify Plus upgrade service.
No. The additional scripts box has been view only since August 28, 2025 (Shopify Help Center). Tracking moves to app pixels or custom pixels in Customer events, and page changes move to app blocks.
Yes, through public App Store apps that contain Functions. Custom apps with your own Functions need Shopify Plus (Shopify dev docs).
It is designed not to. Extensions, Functions and pixels plug into checkout through supported APIs instead of overriding its code, so Shopify can ship checkout updates without breaking them.
Simple branding and tracking work typically takes 1 to 2 weeks. Rebuilding Scripts as Shopify Functions or building custom checkout UI extensions typically takes 2 to 6 weeks. These ranges are for planning, not a quote.
Ecomzier has built 1,100+ Shopify stores that have generated $500M+ in client revenue, backed by 11 eCommerce awards and 400+ five star reviews. Book a call and we will review your checkout and Scripts reports with you and list what to rebuild.