Last verified 2026-07-14
shopify scripts deprecation breaking checkout discount
Deprecated Plus scripts can break checkout after Shopify’s migration windows. Inventory which scripts still run, then replace before the next promo.
The actual problem
Legacy Scripts discounts stop applying after Checkout Extensibility migration, spiking bounce and support tickets.
Do this
- Confirm whether the shop still relies on Scripts vs Functions/UI extensions.
- Rebuild critical discounts as Shopify Functions before turning Scripts off.
- A/B test checkout totals for top promo codes on mobile.
- Freeze paid acquisition until discount parity is verified.
Tools for this job
- Tillkiln
Catch stacking/discount leaks after migration
Scan the live storefront for stacking, OOS-buyable, and dead links before you blame ads → tillkiln.com.
- Shopify Discount Docs
Current combine + Functions guidance
Related intents
Scan the store before more ad spend
Tillkiln finds checkout and storefront leaks — stacking discounts, OOS still buyable, dead collection links — with a rough $ leak estimate.
Also from Cashkiln
- Tillkiln — scan checkout leaks before you buy more ads
- Netkiln sample — client-ready revenue-health page from a payouts CSV ($19 clean unlock)
- Free leak checklist — six operator checks
Deep-dive report — $29
Self-serve checklist expansion for this query family. PayPal Checkout. No call.