Shopify Scripts Is Gone: Your Functions Migration Checklist

Legacy Shopify Scripts was fully retired on June 30, 2026. As of July 1, any discount, shipping, or payment customization still running on Scripts simply stops executing — and the fix is to rebuild that logic on Shopify Functions.

If a store-wide promo, a tiered shipping rule, or a payment-method restriction quietly disappeared this week, Scripts retirement is almost certainly why. The good news: Functions is faster, versioned, and testable — this is a forced upgrade, not just a chore. The bad news: nothing migrates itself.

What actually broke

• Line-item Scripts: automatic discounts, bundles, gift-with-purchase, and volume pricing logic.
• Shipping Scripts: rate renaming, hiding, reordering, and conditional shipping rules.
• Payment Scripts: hiding or reordering payment methods by cart, customer, or address.
• Anything that depended on the Script Editor app — it no longer runs at checkout.

The migration checklist

1. 1Inventory every active Script and document exactly what business rule each one enforced.
2. 2Map each to the right Function API — Discounts, Delivery Customization, or Payment Customization.
3. 3Rebuild the logic as a Shopify Function (Rust or JS/Wasm), deploy it, and attach it via the admin or a discount.
4. 4Validate against real cart scenarios: edge cases, stacking rules, and international addresses.
5. 5Run old-vs-new in a staging or preview checkout before you rely on it in production.
6. 6Delete the dead Script references and update internal runbooks so no one expects Scripts back.

Common migration traps

The rebuild rarely fails on the happy path — it fails on the edges. Watch for discount stacking that behaved one way in Scripts and another in Functions, currency and rounding differences on international carts, and shipping rules that depended on cart attributes you now need to pass explicitly. Test each rule against your messiest real orders, not just a clean sample cart, before you trust it in production.

Why Functions is worth the move

Functions run server-side at the edge, are version-controlled, and can be unit-tested — so the customizations that were fragile and invisible under Scripts become code you can review and roll back. Pair them with Checkout Extensibility and you get a checkout you can actually maintain, rather than a black box.

Scripts didn't get deprecated — it got switched off. If your checkout logic vanished on July 1, migrating to Functions is the fix, and it can't wait.