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Best Discounts, Shipping, & Payments Scripts Migration powered by Functions Shopify apps in 2027 [Updated]
PickYourApp Review Team
6 min read
•
Aug 21, 2026
Shopify merchants transitioning from Scripts to Functions can maintain their custom discount, shipping, and payment logic with these specialized migration apps. The best Shopify apps in this category simplify the technical shift from Shopify Scripts to the newer Functions framework, preserving existing business rules without disrupting operations. These tools handle complex customizations automatically, ensuring checkout experiences remain consistent while meeting Shopify's updated requirements.
| Name | Rate on Shopify | Price | Free trial | Key features |
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#1. Generate discounts, shipping, payment & validation functions. ShopTank winner at Editions 25.
Looking to replace your Shopify Scripts? SupaEasy helps merchants create custom functions for discounts, shipping, payments, and validation - without any coding knowledge. As a ShopTank winner at Editions 25, this app makes function migration simple for all Shopify stores, not just Plus merchants. Generate functions three ways: use the migrator tool, choose from presets, or let the AI assistant create exactly what you need. Simply describe your requirements, and the AI will build your custom function. Perfect for merchants who want complete checkout control while transitioning from Scripts to Functions. Whether you're upgrading existing scripts or creating new functions, SupaEasy makes checkout customization straightforward for every Shopify store owner. -
#2. The easiest way to build Functions for discounts, bundles & order rules. Migrate your scripts today!
Shopify Scripts are being deprecated — Nexus Functions is your modern solution for checkout customization. This app helps Shopify Plus merchants and store owners create custom Shopify Functions for discounts, payments, delivery, and validation without any coding required. Easily migrate your existing Scripts to Functions in just a few clicks using the built-in Script Migrator. Build advanced checkout rules manually, select from smart presets, or use the no-code interface to create tiered discounts, BOGO offers, and custom bundle discounts. Works on all Shopify plans — no Plus plan required. Take full control of your checkout experience with Functions Creator & Discount and customize discounts, payment methods, delivery options, and order validation rules to match your business needs. -
#3. The modern replacement for Scripts - Create discounts, shipping, payment & validation with functions
PowerX is a modern replacement for Shopify Scripts that helps merchants create discount rules, customize checkout, and manage shipping and payment options without coding. Build complex promotional strategies with up to 50 automatic discounts per function and handle discount combinations easily. Customize your shipping rates by renaming, hiding, or reordering delivery options. Optimize payment methods and their presentation at checkout. Migrate your existing scripts to functions with no limits, available on all Shopify plans. Import and export campaigns between staging and live stores for seamless workflow management. -
#4. Advanced functions creator with Flow logic builder. Build and test functions as flows in minutes.
Function Studio lets you build Shopify Functions visually without code. Create advanced custom discounts including BOGO, Buy X Get Y, bundles, volume bundles, tiered discounts, fixed-price offers, and GWP discounts using the Flow logic builder. Set up payment customizations, delivery customizations, cart validation rules, and checkout validation. Configure conditional discounts for multiple markets, currencies, and POS locations. Build cart transforms for bundle discounts and reject discount codes when needed. Perfect for merchants migrating from Shopify Scripts to Shopify Functions. Design percentage, dollar, or fixed-price discounts with metafield and JSON support. Test your functions as flows in minutes and take your discount strategy to the next level.