Shopify Scripts End June 30. Your Checkout Won't Warn You.

There is a kind of outage that never shows up in an error log, and on June 30, 2026 a lot of Shopify Plus brands are going to have one. That is the day Shopify Scripts stop executing for good -- the final date after three years of extensions. The trap is that when a Script dies, your checkout does not crash. It simply reverts to standard Shopify behaviour. The tiered discount stops applying, the freight rule you wrote disappears, the payment method you deliberately hid comes back, the wholesale price quietly becomes the retail one. No alert fires. The first place most teams will notice is the margin report a week later, by which point the orders already shipped at the wrong numbers. With the create-and-edit lock already in place since April 15, the window to fix this calmly is almost closed.

What is actually happening, in plain terms

Shopify Scripts were, for years, the only no-app way to customise checkout on Shopify Plus: small pieces of Ruby that ran on Shopify's servers to bend discounts, shipping rates, and payment options at the moment of purchase. Shopify is retiring them and moving everything to Shopify Functions. Two dates matter, and the first one has already passed.

• April 15, 2026 (done): you can no longer create or publish new Scripts, or edit the ones you have. Whatever logic is live today is the logic you are stuck with until you replace it.
• June 30, 2026 (the cutoff): all remaining Scripts stop running. Anything still depending on a Script reverts to default checkout behaviour with no grace period and no warning.

That second point is the whole story. A loud failure is easy -- you see it, you fix it. A silent revert is a slow leak: the brand keeps taking orders, the checkout keeps converting, and the only symptom is that the numbers are wrong in a direction nobody is watching.

Why this is a revenue risk you cannot see

Think about what your Scripts actually decide. Every one of them is a rule about money or eligibility applied at checkout, and every one has a default it falls back to when it stops running. A buy-more-save-more discount falls back to no discount, which usually means the customer pays full price and a promised offer evaporates -- or, if your storefront still advertises the deal, you get a wave of support tickets and chargebacks. A shipping Script that suppressed a courier in regions you cannot service falls back to offering it, so you sell delivery you cannot fulfil. A payment Script that hid cash-on-delivery above a risk threshold falls back to showing it, and your COD return-to-origin losses climb. None of these announce themselves. This is exactly the kind of quiet checkout failure that erodes conversion and margin without a visible cause, the same blind spot we wrote about in why shoppers abandon your Shopify checkout.

The reason it is hard to catch is that the checkout is the one place you do not casually test in production. Most teams trust it precisely because it has worked for years, so a rule that silently stops applying can run for days before anyone connects a margin dip to a missing line of Ruby that expired on schedule. This is the point where most founders realise the deadline is not an IT chore.

The migration is an audit, not a port

The easy mistake is to treat this as a translation job: take the Ruby, rewrite it as a Function, ship it, done. That misses what Scripts really were. They were not just code -- they were your checkout business rules, and most of those rules run on data. A discount tier depends on which customer group a buyer belongs to and what they spend. A shipping rule depends on the destination and sometimes live stock at a location. A wholesale price depends on a contract. The Script was just the thin layer that read that data and acted on it at checkout.

So the right way to approach the migration is to inventory the rules first, then rebuild them -- and while you are in there, fix where each rule gets its data. Shopify Functions are the destination, but they are a genuinely different architecture from Scripts: compiled modules that live inside a custom app, not snippets you paste into the admin. That makes the rebuild a real project hosted in proper Shopify development, which is inconvenient on a deadline but also an opening. You are going to open up every checkout rule anyway. That is the cheapest time you will ever get to make those rules read from one correct source instead of a hardcoded table that drifted.

The four kinds of Scripts, and what each silently reverts to

Almost every Script in the wild falls into one of four buckets. Sorting yours this way tells you what breaks and how dangerous each one is.

Discount and pricing Scripts

Tiered discounts, automatic bundles, spend thresholds, loyalty-tier pricing. On June 30 these revert to no automatic discount. The customer-facing risk is a promised offer that does not apply; the internal risk is that your hardcoded price tiers were probably out of date already. Rebuild these as discount Functions, and point them at the customer and product data that should define a tier rather than a number typed into Ruby two years ago.

Shipping Scripts

Hiding, renaming, or reordering delivery methods; surcharges for remote pin codes; free-shipping thresholds. These revert to your raw carrier and rate settings. The danger is selling a service level you cannot honour -- a refund and an angry customer, the worst kind of checkout promise to break.

Payment Scripts

Hiding or gating payment methods -- the classic case being a cash-on-delivery cap above a fraud or ticket-size threshold. These revert to showing every enabled method to everyone, which can reopen a fraud and return-to-origin exposure you closed deliberately.

B2B and wholesale Scripts

Contract pricing, net-terms gating, minimum-order rules for wholesale accounts. These are the most expensive to get wrong, because the fallback is your retail price and retail rules applied to a B2B buyer -- either a margin you never agreed to or a blocked order from your best account. The pattern across all four: the fallback is never neutral. It is always a rule you specifically chose to override, now un-overridden at the worst possible moment.

What this looks like for a real D2C brand

Take a personal-care brand selling direct in India and also running a small wholesale book through the same Shopify Plus store. Over two years they had accumulated nine Scripts: a buy-2-get-1 on a hero SKU, a remote-pin-code shipping surcharge, a COD cap above a fixed cart value, and a set of wholesale contract prices for about thirty stockist accounts.

On a normal Tuesday, none of that is visible -- it just works. But every one of those nine rules was written against numbers typed straight into the Script: the SKU list for the offer, the pin-code surcharge bands, the COD threshold, and the per-account wholesale prices. The wholesale prices in particular had drifted, because three stockists had renegotiated terms that were updated in the finance system but never reflected back in the Ruby. The Script was quietly charging two of them last year's price.

When this brand rebuilt the rules in Functions, the win was not the new code -- it was being forced to ask where each rule should read its truth. The wholesale prices moved out of the checkout layer and into the system that actually owns customer contracts, kept aligned through a single Shopify-Odoo integration so a renegotiated price updates once and shows correctly at checkout. The COD cap and the offer SKUs became data the operations team could change without a developer. The deadline that felt like a tax turned into the reason a set of stale, developer-only rules finally became live, owned data -- the same connected backbone we argue for in Shopify Plus is not an ERP.

The data question Functions force you to answer

Here is the honest part. You can rebuild every Script as a Function exactly as it was, hardcoded numbers and all, and pass the deadline. It will work on June 30. It will also carry forward every stale tier, every drifted price, and every rule only one developer understands -- you will just have re-housed the same fragile logic in a newer building.

The better outcome is to use the forced rebuild to answer one question per rule: what is the source of truth for the data this rule depends on, and is the checkout reading it live? A discount tier should reflect the customer's real status and spend. A shipping rule should reflect destinations you actually service and, where it matters, real stock at the fulfilling location. A wholesale price should reflect the contract as it stands today, not as it stood when someone last edited a Script. That is an order and pricing data problem, and getting it right is what makes the checkout trustworthy long after this particular deadline is forgotten. Clean, single-source rules are also what every smarter layer on top -- personalisation, agentic checkout, an AI-native storefront -- depends on to behave.

Your plan for the days that are left

The calm window is gone, but a controlled migration is still very doable. Move in this order.

1. Inventory every Script today. Pull the Shopify Scripts customisations report, list each one, and sort it into the four buckets above. For each, write down the single sentence: when this stops, checkout will instead do X. That sentence is your risk register.
2. Rank by money and by silence. Prioritise the rules whose fallback costs the most and shows the least -- wholesale and payment rules usually top both lists. Those are the ones that bleed quietly.
3. Rebuild as Functions in a custom app, on a dev store. Because the April 15 lock means you cannot touch the live Scripts anyway, build and QA the replacements in parallel against a Plus dev environment, checking the money path, not just that the page loads.
4. Fix the data source while it is open. For every rule, decide where its data should live and wire the Function to read it, rather than copying the old hardcoded values across.
5. Cut over before the 30th, with monitoring on the numbers. Aim to be live with a few days of buffer, and watch discount application rate, shipping-method mix, payment-method mix, and average order value for the first week -- those metrics, not error logs, are where a missed rule will show.

Do it in that order and the deadline becomes a one-time cleanup with a lasting payoff. Ignore it and June 30 becomes the day your checkout started telling your customers a different story than you intended, without telling you.

The takeaway

Shopify Scripts stop running on June 30, 2026, and the editing lock has been in place since April 15, so this is no longer something to schedule for later. The real risk is not a crash -- it is the silent revert, where custom discounts, shipping rules, payment gating, and wholesale prices quietly fall back to defaults and you learn about it from your margin. Treat the move to Functions as an audit of your checkout business rules rather than a code port: inventory every rule, rank by what its fallback costs, rebuild on a dev store, and fix where each rule reads its data while you have it open. Do that and a forced deadline leaves you with a checkout that is both compliant and, for the first time, running on data you can actually trust.