Today is the Shopify Scripts deadline. As of midnight June 30, the legacy Scripts engine is fully removed — every discount rule, shipping customization, and payment option running on Scripts stopped working.
If you haven't migrated to Shopify Functions yet, your checkout is broken right now. You won't see an error. The store loads fine. Discounts just silently miscalculate, free shipping thresholds don't trigger, and payment filtering does nothing.
The rest of this article is about the bigger picture: what Shopify's Summer '26 Editions shipped in early June that actually matters for your paid media returns.
what broke and how to fix it
Scripts handled three things: discount logic, shipping rate customization, and payment filtering. All three stopped at midnight.
Test your checkout right now. Run a transaction that would normally trigger a discount. If it doesn't work, your developer needs to rebuild that logic in Shopify Functions — the serverless replacement that's been available since 2024. The migration itself takes a few days. Getting started today beats waiting another week.
For stores on standard plans: most discount customization now lives natively in Shopify's Discount Settings. You may not need Functions at all.
The silent failure mode is what makes this dangerous. One real-world example from the migration guides: a DTC apparel brand running mid-seven figures saw Facebook ROAS drop from 4.2x to under 1x in a single quarter — not because of ad performance, but because stacked discount logic broke and customers were being overcharged at checkout. They didn't catch it from ad data. They caught it from support tickets.
checkout blocks: the conversion math
Here's what's actually new and why paid media managers should care: Shopify made Checkout Blocks generally available to all Plus merchants in Summer '26 Editions (launched June 2).
Checkout Blocks lets you add trust signals, upsells, custom fields, and BOGO logic to the checkout via drag-and-drop — no third-party app, no custom code required. Early adoption data shows 8–22% conversion rate improvement depending on what you add and test.
The paid media math on that: if you're paying $2 per click and converting at 2%, you're at $100 per customer. A 12% checkout conversion improvement brings that to $89. Same ad spend. Same traffic. Better return.
If you've been running paid traffic to a checkout you've never optimized, Summer '26 Editions just removed the excuse. Checkout Blocks is free for Plus merchants. The 8–22% lift range is wide because the effect depends entirely on what you test — trust signals near the buy button typically move the number more than product recommendations in cart.
The limitation: Plus-only. If you're below roughly $50K monthly revenue, this isn't available yet.
rollouts: native A/B testing without the monthly bill
The most underreported update in Summer '26 Editions: Shopify added native A/B testing on June 5, 2026, called Rollouts. Find it under Markets > Rollouts in your admin.
You can now split-test themes, checkout configurations, and customer account pages natively — without Intelligems, without custom middleware, without paying $300/month for something Shopify now includes.
Why paid media managers should care: you've been buying clicks and sending them to a checkout you haven't properly tested. The main reason most DTC brands don't run checkout A/B tests is cost and complexity. Rollouts removes both barriers at once.
Run a 50/50 split between two checkout layouts for 30 days. See which one converts the traffic you're already paying for. Start with mobile checkout — that's where paid traffic lands most and where conversion rates diverge most sharply between designs.
AI merchandising native in your admin
Summer '26 Editions also shipped AI Collection Sort, Predictive Cross-Sell Blocks, and a Merchandising Insights panel — all native in the admin, no app required.
AI Collection Sort ranks products in collection pages automatically using purchase and browsing signals. Predictive Cross-Sell Blocks surfaces product recommendations in cart and post-checkout based on order history. Both were features brands were paying $50–$200/month to third-party apps to get.
Neither is a standalone game-changer. But combined with Checkout Blocks and Rollouts, you now have a full CRO stack inside your Shopify admin that didn't exist six months ago. The SaaS spend you free up can go back into ad budget or margin.
the priority list for today
If you haven't migrated Scripts: do a test transaction right now. If anything with discounts or shipping looks wrong, call your developer. This is a live revenue problem, not a future one.
If you're on Plus and haven't installed Checkout Blocks: set it up this week. Start with trust signals — they tend to move checkout completion rates faster than anything else. Then use Rollouts to A/B test the layout against your current checkout.
If you're not on Plus: Rollouts is still available for theme and account-page testing. Native and free beats $300/month for what's now table stakes.
For any Plus merchant: pull your checkout completion rate in Analytics. If it's below 70%, that's where your paid traffic is leaking — and you now have the tools to fix it without adding another app.
If you want to see how checkout conversion maps to your actual paid account performance, the free ad audit at Gromerce shows where traffic converts and where it drops.
The Scripts cleanup was messy. The Summer '26 Editions features that replaced everything are, actually, worth using.
Sources: Shopify Summer '26 Editions announcement, Shopify Engineering Blog, novadata.io, fudge.ai, revize.app, June 2026
