May 27, 2026 by Alex Massaad · 6 min read
What Happens to Your Shopify Plus Store on July 1 If You Haven't Migrated Scripts
We’ve fielded the same call three times this month. A Shopify Plus merchant, usually a director of ecommerce, realizes their team hasn’t started the Scripts to Functions migration. June 30 is close enough to count on a calendar. The question is always some version of “how bad is it if we don’t make it?”
This post is the honest answer.
What Happens to a Plus Store on July 1?
On July 1, 2026, any active Shopify Script on your Plus store stops executing. Line item, shipping, and payment Scripts simply do not run. Your checkout still works. Your store still takes orders. But every piece of custom checkout logic that was running through a Script is gone, and your customers will see different behavior the morning of the cutover.
The store does not go down. The Scripts go silent.
What Actually Breaks
It depends on what your Scripts were doing. The common patterns:
Discount Scripts go silent. A “buy 3 get 1 free” rule, a tiered volume discount, a customer-tag-based price override. All of it stops. Customers who expected the discount see full price at checkout. If the discount was structural to a promotion, the promotion is broken until you replace the logic.
Shipping Scripts stop running. Hidden shipping methods become visible again. Renamed shipping options revert to their raw carrier names. Conditional shipping rules (free shipping over a threshold, regional restrictions) stop applying. Carts that should have shown one option might show three, or the wrong one.
Payment Scripts stop running. Hidden payment methods become visible. Reordered payment methods revert. Customers who were being routed to a specific payment flow based on cart contents see the default Shopify ordering instead.
Anything downstream that depended on those Scripts is unstable. Email flows triggered by discount codes, ERP integrations that read line item properties set by a Script, fulfillment rules that depended on a shipping Script’s behavior. All worth auditing.
How You Find Out
The clean answer is: check your Script Editor in the Shopify admin. As of April 15, 2026, you cannot create or edit Scripts, but the existing ones are still visible. Count them. Note what each one does.
The harder answer is: a lot of Plus merchants have Scripts written years ago by someone who no longer works there. The original brief is gone. The Script does something, the store works, nobody remembers exactly why. Finding the dependencies takes longer than rewriting the logic.
If you have not yet done an audit, this is the single highest-leverage hour you can spend right now. We covered the audit step in detail in our Shopify Functions vs Scripts migration walkthrough.
What You Can Still Do in the Remaining Weeks
There are five weeks between this post and the deadline. Honest assessment of what’s achievable:
One to three simple Scripts: absolutely doable. A single rule per Function, straightforward translation. One developer can complete a clean migration on three Scripts in a focused week. Two weeks if you include staging, testing, plus deployment review.
Four to eight Scripts of moderate complexity: tight but possible. Plan three to four weeks of focused work. You will not have time for elegant refactoring. You translate each Script as-is, ship, then revisit later.
Nine or more Scripts, or Scripts with significant complexity: you are not making the deadline cleanly. Triage now. Identify the two or three Scripts whose absence would hurt revenue most. Migrate those. Accept that the rest will break briefly while you finish the migration in July.
The triage call is harder than the migration. Most merchants want to ship everything. The truth is that some Scripts are protecting $50 in annual margin and some are protecting your top promotion. Treat them differently.
What to Do if You Will Miss the Deadline
Some merchants are going to wake up on July 1 with broken checkout logic. If that is you, the priority order:
1. Confirm what is broken. Run a real checkout on a test cart that exercises the missing logic. Document what the customer sees versus what they should see. Screenshot every wrong state. Without this, you cannot triage.
2. Communicate to your team. Customer support needs to know which orders might come in with the wrong discount applied. Finance needs to know which promotions are inactive. The marketing team needs to pause any campaigns that promised behavior your store cannot deliver. Inform internally before the first customer complaint lands.
3. Decide what to revenue-protect first. Almost every broken Script falls into one of two buckets. Either the customer pays more than they should, or the customer gets something they should not. The first hurts conversion. The second hurts margin. Triage by which is bleeding faster.
4. Stand up a stopgap. For some logic, a temporary Shopify discount code, a manually-edited shipping rate, or a checkout UI change can hold the line while you finish the Function. Stopgaps are not pretty. They buy you time.
5. Migrate properly the week after. Once the worst is contained, run the proper migration as if the deadline were still ahead of you. Do not leave stopgaps in production beyond a week or two.
Common Mistakes We See in the Last Mile
A few patterns from the migrations we’ve watched go sideways:
Rewriting in Ruby out of habit. Functions are JavaScript or Rust. Some teams try to port Ruby logic line by line. The result is verbose, slow, plus often wrong. Functions are reactive and stateless in ways Ruby Scripts were not. Treat the migration as a rewrite, not a translation.
Skipping the test cart. A Function that compiles is not a Function that works. Every Script we migrate gets exercised against a real test cart with the conditions the original Script was meant to handle. Sounds obvious. We have seen migrations skip this step because the deadline was tight, then ship a Function that did the opposite of what was intended.
Ignoring the staging environment. Plus stores often have a development store available. Use it. Migrate, validate, then push to production. Plus stores are too big to debug in production under deadline pressure.
Not telling customer support. The team handling customer messages on July 1 needs to know what changed. A confused support agent telling a customer “that’s how it works now” can do more damage than the broken Script itself.
If You Need Help This Week
The most useful thing a Shopify Plus agency can do in the next five weeks is two things: an honest audit of which Scripts you have and what they do, plus rapid migration of the ones that matter. We are running these projects right now for Plus merchants who realized the deadline late.
If you want a sanity check on your remaining Scripts, or you need a team to take the migration off your plate while you focus on the rest of your business, send us a note. We will tell you honestly whether your scope fits the runway, and if it does not, we will help you triage what to migrate before July 1 versus what to absorb as a brief outage.
Either way, do the audit today. The single worst version of July 1 is the one where you discover the breakage from a customer email.
