Shopify Plus Has 10 Weeks Before Checkout Logic Breaks
If you run a Shopify Plus store, your checkout has a hard expiry date. June 30, 2026. That is when every Shopify Script stops executing. No grace period, no extension, no rollback.
The first domino already fell on April 15. The Script Editor is frozen. You cannot edit a live Script anymore and you cannot publish a new one. Anything broken today will stay broken until you replace it with a Shopify Function.
That leaves a 75-day window where your BOGO logic, tiered pricing, wholesale rules, and payment method hiding are running without a safety net. And most Plus stores we have looked at still have not started the migration properly.
This post is for the merchants and in-house teams who know the deadline is coming but are not sure what the real risk is, what actually needs to move, and how to move it in ten weeks without breaking a live checkout.
What changed on April 15 and why it matters
Before April 15, Scripts behaved like a normal Shopify feature. You could open the Script Editor, tweak a rule, publish, done. After April 15, Shopify froze the Script Editor globally. Existing published Scripts keep running as they were on that date, but you cannot touch them.
That one sentence has two consequences most merchants underestimate.
First, there is no rollback path. If a Script starts misbehaving because of a product catalog change, a new payment gateway, or a conflicting app, you cannot patch it. You can only replace it with a Function.
Second, there is no stopgap. You cannot write a quick hotfix Script to mask a bug while the team figures out a fix. Every new piece of checkout logic from this point forward has to go through the Functions stack.
Then on June 30, 2026, Shopify turns Scripts off entirely. Any store still relying on Scripts after that date will see its custom discounts, shipping rules, and payment conditions silently stop applying. Checkout will still load. Orders will still go through. Your pricing rules will just not fire.
The 75-day window most people are not planning for
Between now and June 30, you are running on code that cannot be fixed and is about to be turned off. The risk is not the deadline itself. The risk is the ten weeks in between.
A Plus merchant we spoke to last week had a Script that hid Afterpay for carts above a specific threshold. A new product launched, the catalog structure shifted slightly, and the Script started hiding Afterpay on every cart. Pre-April 15, that was a twenty-minute fix. Now it is a full Function build or a scramble to find an app that does the same job.
If you are running mission-critical pricing or payment logic on Scripts right now, treat the next ten weeks like you are running on a staging environment you cannot deploy to. Audit everything. Have a replacement path ready for each Script. Do not wait for something to break.
What your Scripts are probably doing
Most Plus stores we audit have three to eight Scripts running, usually a mix of these:
- BOGO and free gift logic. Buy X get Y, spend threshold gifts, cart-level freebies.
- Tiered or volume discounts. 10 percent off at 3 units, 15 percent at 5 units, 20 percent at 10 units.
- Wholesale or B2B pricing. Customer-tag-based discounts, usually tied to a wholesale storefront or price list.
- Payment method rules. Hide cash on delivery for orders over a set value. Hide Afterpay for subscriptions. Show a specific gateway only for tagged customers.
- Shipping rules. Hide express shipping for oversized items. Free shipping for certain customer tags above a threshold.
- Cart restrictions. Maximum quantity per customer, region-based restrictions, SKU combination rules.
Some of these move cleanly to Functions. Some do not. The audit step is not optional, and it is the single most useful thing you can do this week.
How to pull your Scripts audit in five minutes
Go to your Shopify admin, open the Script Editor, and look for the Customizations report. Shopify built this specifically to help Plus merchants map their Scripts to Function replacements. It lists every Script you have, what it does, and flags the ones that have a known public app or native feature equivalent.
The report does not catch every edge case. A Script that checks a customer metafield for a custom B2B rule will usually show up as "needs custom Function." But it gives you a starting inventory, and that is the thing most teams are missing.
Export the list. For each Script, write down the business outcome, not just what the code does. "10 percent off cart totals over $200 for VIP-tagged customers" is more useful than "discount_script_v2.rb" when you are deciding the replacement path.
The three replacement paths and how to pick
Every Script has one of three migration paths. Picking the right one for each Script is where most of the time goes.
1. Native Shopify features
Shopify has quietly added a lot of checkout capability directly into the admin over the last two years. Automatic discounts now cover BOGO, spend thresholds, combo rules, and customer segments. Shipping profiles handle most free shipping conditions. Checkout rules handle a lot of payment method logic.
If your Script is doing something generic, this is the cheapest path. Zero recurring cost, no dependency on a third party, and Shopify maintains it. If your BOGO is literally "buy 2 shirts, get 1 free," native features cover it.
2. App Store Functions apps
For anything mid-complexity, a Functions-based app is usually the fastest way off Scripts. Apps like Discount Kit, Kite, and Easy Bundle Builder give you BOGO, tiered pricing, and cart transforms without writing code. Shopify Functions runs up to 25 concurrent Discount Functions, so you can stack multiple apps without performance penalties.
The trade-off is monthly cost and some loss of control. You are trusting the app developer to keep pace with Shopify API changes, and you are constrained by the app's configuration model. For 70 percent of merchants, this is the right call.
3. Custom-built Functions
You need this path when your logic reads customer metafields, applies conditional B2B pricing based on account properties, uses complex product metadata, or enforces rules that no app replicates. Functions are written in Rust or JavaScript, compiled to WebAssembly, deployed via the Shopify CLI.
For a Plus store with five to eight complex Scripts, budget two to four weeks of a senior Shopify developer's time. This includes auditing, building, parallel testing, and switching over. A store with simple Scripts or only one or two can often be done in a week.
Why Functions are actually better than Scripts, not just different
Scripts were written in Ruby and ran inside Shopify's checkout pipeline. They worked, but they came with real constraints. Performance was inconsistent, debugging was painful, and the feature surface was limited to discounts, shipping, and payments.
Functions are a different architecture. They compile to WebAssembly, which means consistent sub-5 millisecond execution and no cold starts. They run in an isolated sandbox, so a buggy Function cannot take down your checkout. They have access to a much bigger API surface, including cart transforms, checkout validation, order routing, fulfillment constraints, and delivery customization.
The 2026-04 GraphQL Admin API also gave Functions access to metaobject entries, which is a quiet but important change. You can now query structured data (tiered pricing rules, B2B price lists, bundle configurations) directly inside a Function. That was not possible before, and it closes one of the biggest gaps that kept some merchants on Scripts.
There is also a cross-plan benefit. Functions delivered through apps work on Basic, Grow, and Advanced plans, not just Plus. That means if you ever downgrade or spin off a sub-brand, your checkout logic does not disappear with your Plus subscription.
What to do this week if you have not started
If your migration has not begun, do these five things in order. None of them need a developer for the first round.
- Pull the Scripts customizations report from your admin. Export the list. This is your audit.
- For each Script, write the business outcome in one sentence. Decision makers need this, not the code.
- Tag each Script with a migration path. Native feature, app, or custom Function. Be honest about which ones are complex.
- Install Functions apps for the easy wins first. BOGO, simple tiered pricing, standard payment hiding. Get these parallel-running alongside the old Scripts.
- Book the developer time for the hard ones now, not in June. Senior Shopify developers who know Functions are already booked solid through May in our network.
Shopify lets you run Scripts and Functions side by side. Use that. Build the Function, deploy it, test it in parallel with the live Script, compare outputs on real orders, then disable the Script once you have parity. Do not cut over cold.
The gotchas we keep running into
A few migration issues come up on almost every Plus store we work on. Flag these early.
Metafield-dependent pricing. If your Script reads a product or customer metafield to set a price, you need the 2026-04 API or newer. Older Function templates will not have access to the data you need.
Customer-tag B2B rules. Tag-based pricing moves fine, but the pattern for doing it in Functions is different. If your Script chains multiple tag checks, plan to rewrite the logic structure, not translate it line for line.
Payment method hiding. Functions cover this, but the API is stricter about what you can key off. If you hide a method based on a complex cart computation, test early. The parity is usually there but the code looks different.
Regex and string matching. Scripts in Ruby handle string patterns one way. Functions in Rust or JavaScript handle them differently. Anything doing fuzzy matching on SKU patterns or product titles will need a rewrite, not a translation.
Order of operations. If you have multiple Scripts stacking discounts in a specific order, Functions evaluate differently. Test the final cart math on real orders, not just one Function at a time.
When you need a developer and when you do not
If your Scripts are doing standard BOGO, tiered cart discounts, free shipping thresholds, or simple payment hiding, you probably do not need a developer. Native features or a couple of apps will get you there in a day.
You need a developer if any of the following apply:
- You read customer metafields to drive pricing or payment logic
- You have B2B pricing tied to company accounts, custom price lists, or quantity breaks per customer
- You stack three or more Scripts and the order of operations matters to the final cart value
- Your Scripts integrate with a third-party ERP or wholesale system through webhooks or tags
- You have custom shipping logic that depends on product attributes no app supports out of the box
A senior Shopify developer with Functions experience is the difference between a clean migration and a checkout incident. If you are in this camp, start booking time now. The developer supply is tightening the closer we get to June.
FAQs we keep getting asked
Will Shopify extend the deadline again?
Probably not. They already pushed it from August 2025 to June 30, 2026. The April 15 freeze is the real commitment signal. Treat June 30 as final.
Can I keep one or two simple Scripts and migrate the rest?
You can run Scripts and Functions together until June 30, but every Script you keep is one you have to migrate eventually. Do not split the effort. Migrate everything, then decommission.
What happens to my checkout on July 1, 2026 if I do nothing?
Checkout still loads. Orders still go through. Your custom discount, shipping, and payment rules silently stop firing. Customers may pay full price instead of discounted, get offered payment methods you did not want them to see, or miss out on promotions you are still advertising.
Do Functions cost more than Scripts?
Scripts were free on Plus. Functions themselves are also free. The cost is in the apps you install, which range from $10 to $100 per month, or in developer time if you build custom. For most merchants, the total is still well under what a broken checkout costs for a week.
Is the Scripts customizations report enough to plan a migration?
It is enough to start. It will not catch every edge case, especially on metafield-based logic or custom tag rules. Pair it with a manual review of each Script and a one-sentence business summary for each.
The short version
April 15 froze your Scripts. June 30 turns them off. You have ten weeks. Pull the audit, tag the easy wins, book developer time for the hard ones, and run Functions in parallel before cutting over.
If your store is running five or more Scripts and you are still in the audit phase, we can help you move faster without risking your checkout. Drop us a note and we will walk through your customizations report with you.