Best free Payment Customizations powered by Functions Shopify apps in 2026 [Updated]

SMART Checkout Rules & Upsells gives merchants complete control over their checkout experience with flexible validation rules and customization options. Hide, block, sort, or rename payment methods and shipping options based on conditions like customer tags, country, cart value, products, or discount codes. Perfect for managing high-risk orders, blocking COD or specific payment methods like PayPal and Credit Card by customer criteria. Grow your average order value with one-click post-purchase upsells and downsells that appear after checkout. Add checkout blocks including banners and discount codes with conditional display rules. Apply checkout validation and discount logic based on cart total, customer tags, or delivery method. Ideal for B2B stores, international shipping flows, and merchants who need advanced checkout control without coding. Control your checkout rules and increase conversions with smarter upsell strategies.

Take control of your Shopify checkout payment options with ETP Sort & Hide Payment Methods. Customize how payment methods appear by hiding, sorting, or renaming options like PayPal, credit cards, Cash on Delivery (COD), and manual payments. Create specific rules based on shopping cart value, shipping method, customer location, product SKUs, or customer tags. The app lets you show only relevant payment options to different customers without any coding needed. All changes apply instantly to your checkout, making it easier for customers to complete their purchase with their preferred payment method.

This app helps you create advanced Shopify Functions for discounts, payments, delivery, and checkout validations without coding. Build tiered discounts, BOGO functions, bundles, volume discounts, and custom promos using a simple no-code function creator. Perfect for migrating Shopify Scripts to Functions with just a few clicks. Works on all Shopify plans - no Plus plan required. Set up payment customizations, delivery customizations, and checkout rules to control your store's logic. The script editor alternative makes it easy to apply bulk discounts, automate bundle offers, and create flexible discount functions. A complete Shopify Scripts replacement solution with active maintenance to help you build custom functions and manage your checkout experience.

SMART Address Validator helps prevent delivery errors by checking and validating customer shipping addresses in real-time. When customers enter incorrect or incomplete addresses, the app catches these mistakes before orders are shipped, reducing failed deliveries and costly returns. Perfect for businesses dealing with frequent address mistakes or shipping to complex delivery areas, this address validation tool ensures packages reach their intended destination. By confirming address accuracy during checkout, merchants save time on order processing while improving customer satisfaction through reliable delivery service. The app works seamlessly with your existing order fulfillment process to maintain smooth shipping operations.

Checkout Blocks helps you customize your thank you and order status pages without any coding required. Add content blocks to display post-purchase information and set order value limits for your store. Shopify Plus merchants get access to advanced checkout customization features. Create custom fields like delivery notes or terms agreements, validate address formats, and hide or reorder delivery and payment methods. You can also set up custom order discounts and shipping discounts directly in your checkout. The app makes it simple to tailor the checkout experience to match your business needs while maintaining a professional look across all customer touchpoints.