Shopify Scripts stopped running on June 30, 2026. Would you have noticed?

A shopper adds three items to their cart, sees a 20% off banner, applies a discount code that has worked for months, and completes checkout at full price. No error appears. No red banner, no failed-payment screen, no support ticket fires automatically. The order goes through, the confirmation email arrives, and everyone involved believes the transaction was correct. It wasn't. On June 30, 2026, Shopify Scripts stopped executing on every store still using them, and for many merchants the first sign of trouble was a customer complaint that showed up days or weeks later, long after the pattern had already cost them money.

What actually happened on June 30

Shopify Scripts let merchants write small pieces of Ruby code that ran during checkout to adjust line-item prices, filter shipping rates, or hide payment methods based on cart contents. Shopify announced years ago that Scripts would be replaced by Shopify Functions, a newer extension model built for performance and stability. The deprecation wasn't a surprise to anyone reading Shopify's developer changelog, but deprecation announcements are easy to file away and forget, especially if the original developer who wrote the Script left the company or the agency that built it moved on to other clients.

June 30, 2026 was the date Shopify stopped executing Scripts at all. Not a warning banner, not a grace period with reduced functionality, just a stop. Any checkout logic that depended on a Script simply ceased to run, and checkout fell back to Shopify's default behavior: standard pricing, standard shipping rates, all payment methods visible regardless of the conditions the Script used to enforce.

Why a broken script doesn't throw an error

This is the part that catches store owners off guard. A Script failure isn't like a broken theme file or a missing app script tag, both of which tend to throw visible errors or crash a page in ways customers notice and report. Scripts worked by hooking into checkout at specific points and modifying the checkout object before it was finalized. When that hook stops firing, checkout doesn't fail, it just proceeds with the unmodified default. No exception, no console error a shopper would ever see, no reason for anyone to suspect something changed.

That's a meaningfully different failure mode from the kind covered in why Shopify stores lose orders during theme updates, where a broken theme update tends to announce itself with a visibly broken page. A Scripts failure is quieter and, in some ways, more expensive, because the store keeps taking orders the entire time. Nobody's phone lights up. Revenue keeps flowing. It just flows at the wrong number.

What a silent pricing failure looks like from outside

If your store used Scripts for any of the following, the sunset likely changed checkout behavior without changing how the storefront looks:

A wholesale or loyalty tier that received a Script-based discount now checks out at full retail price. A bundle discount that used to apply automatically when three qualifying items were in the cart no longer applies, and the discount not applying isn't logged anywhere a merchant would naturally look. A shipping rule that hid an unprofitable freight option for certain postal codes now shows it to everyone. A payment method that was gated behind order value or customer tag (say, invoicing terms for B2B accounts) is now visible to retail shoppers who shouldn't see it.

None of these produce a support ticket by themselves. Customers who get an unexpected discount rarely complain. Customers who get a bundle deal that fails to apply might complain, might not, and if they do, the ticket usually reads as "is the code still valid?" rather than "your checkout logic is broken," which makes it easy for a support team to answer with a generic reply and move on without escalating.

How to confirm whether you were affected

The fastest way to find out is a real test order, not a settings audit. Pick a discount code, bundle rule, shipping condition, or payment gate that existed on your store before mid-2026, and run it through checkout exactly the way a customer would. Compare the result to what you'd expect. If a 15% wholesale discount used to knock the price down and now doesn't, you have your answer in under two minutes.

It's also worth checking your Shopify admin for any legacy Script editor references, since Shopify has been steadily removing the old Scripts UI as part of the wind-down, and its absence is itself a clue that something used to live there. If you use a developer or agency, ask them directly whether any checkout customization was built on Scripts rather than Functions or a checkout extension app. Agencies that built custom discount or shipping logic years ago don't always flag deprecations proactively unless a support contract explicitly covers platform migrations.

If you've noticed a revenue dip without an obvious cause, a Scripts failure is worth adding to your list of suspects alongside the more common culprits covered in the 48-hour checklist for diagnosing a sudden drop in store sales. A silent pricing error that's been running for weeks can produce exactly the kind of gradual, hard-to-pin-down revenue erosion that checklist is built to catch.

Moving from scripts to functions

Shopify Functions is not a drag-and-drop replacement for Scripts. Functions are built using Shopify CLI and deployed as app extensions, written in languages that compile to WebAssembly, which means most merchants need a developer to translate old Script logic into a Function rather than flipping a setting. If your original discount, shipping, or payment logic was simple (a flat percentage off for a customer tag, a shipping rate hidden above a certain weight), the equivalent Function is usually a modest, well-scoped project. If the logic was elaborate, layered, or written by someone no longer available to explain it, migration takes longer and benefits from someone actually reading the old Script line by line before rebuilding it.

Some merchants avoided a rebuild entirely by switching to a Shopify App Store app that implements discount or shipping logic through supported extension points, trading a custom Script for a maintained app. That's often the more sustainable path for smaller stores that don't want to own custom checkout code going forward. Whichever route you take, treat the migration as complete only after you've placed test orders that exercise every condition the old Script covered, not after the code has been deployed. Deployed and correct are two different milestones.

Watching for the next silent failure

The Scripts sunset is over now, it happened, and either your checkout logic survived the transition or it's been quietly wrong for a while. Either way, the underlying lesson doesn't expire with the deadline. Platform changes that alter checkout behavior without producing a visible error are exactly the kind of failure that slips past manual spot-checks, because a store owner glancing at their own site sees a page that loads fine and moves on.

Cassian™ watches for this category of problem continuously, including order-flow anomalies and pricing checks that would catch a discount silently failing to apply, rather than relying on someone remembering to test it after every platform update. The Cassian Score™ rolls that kind of check into a single number precisely so a healthy-looking storefront doesn't get mistaken for a correctly functioning one. Deadlines like this one are useful reminders, but the stores that come through them cleanest are the ones that were already watching before the date arrived.