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Best Discounts, Shipping, & Payments Scripts Migration powered by Functions Shopify apps in 2026 [Updated]
PickYourApp Review Team
6 min read
•
Jun 02, 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 the modern replacement for Shopify Scripts, letting merchants create custom discount rules and modify their checkout experience without coding knowledge. Build complex promotional campaigns with up to 50 automatic discounts per function, customize shipping methods, and configure payment options through an intuitive interface. Easily manage discount combinations, rename or hide delivery options, and optimize your payment presentation at checkout. The app works across all Shopify plans and allows you to transfer campaigns between staging and live stores. Whether you're a merchant or developer looking to customize your Shopify store, PowerX provides the tools to implement advanced checkout functions with ease. -
#4. Advanced functions creator with Flow logic builder. Build functions as flows in minutes.
Function Studio lets you build Shopify Functions visually without code. Create advanced automatic discounts including BOGO, Buy X Get Y, bundles, volume bundles, tiered discounts, fixed-price offers, and GWP discounts in minutes using the Flow logic builder. Set up payment customizations, delivery customizations, cart validation rules, and checkout validation. Build metafields-based discounts and reject discount codes when needed. Configure conditional discounts for multiple markets, currencies, and POS locations. The app supports cart transforms for bundle discounts and offers percentage, dollar, or fixed price discount options. Perfect for merchants migrating from Shopify Scripts to Shopify Functions who want a visual alternative to coding custom discounts.