Migrating from Shopify Scripts to Shopify Functions
Migrating from Shopify Scripts to Shopify Functions
Overview
Shopify Scripts sunset August 28, 2025. Migrate your UpsellPlus discount automations from Scripts to Shopify Functions before this deadline. Functions are modern, require no coding, and work directly within UpsellPlus.
What You Need to Know
Shopify Functions replace Scripts with:
- No custom code required--configure entirely in UpsellPlus
- Better performance and reliability
- Native checkout integration
- Support for shipping discounts (Scripts limited)
- Future updates and improvements
Migration Steps
1. Find Scripts-Based Offers
- Go to UpsellPlus -> Offers
- Click Edit on each offer
- Check Discount Settings for "Shopify Scripts" indication
2. Document Current Settings
- Note discount type (percentage, fixed amount, BOGO)
- Record discount value
- Note scope (cart, product, or collection)
- Any conditional Smart Rules
3. Switch to Functions
- Click Edit on the offer
- In Discount Settings, select "Use Shopify Functions"
- Re-enter discount type, value, and scope
- Configure any Smart Rules
- Click Save
UpsellPlus automatically creates and registers the Function with your store.
4. Deactivate Old Scripts
- In Shopify admin, go to Settings -> Apps and sales channels -> Script Editor
- Find each UpsellPlus Script
- Click Deactivate to remove it
- This prevents double-discounting
Testing Your Discounts
- Add the upsell product to your cart
- Proceed to checkout and verify the discount appears
- Calculate: expected discount matches actual discount
- Test with different products eligible for the offer
- Check Shopify admin Order -> Discounts to confirm
Troubleshooting
Issue | Solution |
|---|---|
Double-discounting | Deactivate old Scripts in Script Editor |
Discount not appearing | Verify offer is active, Smart Rules are met, cache cleared |
Wrong discount amount | Recheck discount settings match your documentation |
Discount stacking changed | Functions stack with codes and other Functions; test and adjust as needed |
Timeline
- Now--March 2025: Identify and test migration in staging
- April--July 2025: Migrate all production offers, deactivate Scripts
- Before August 28: Confirm all Functions active and Scripts disabled
Don't wait--migrate early to avoid last-minute issues.
Need Help?
- Email support@upsellplus.com with your store URL and issue
- Click ? in UpsellPlus for in-app help
Updated on: 11/02/2026
Thank you!