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tomtoto757
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shopify-checkout-extensions

Customize Shopify checkout with UI extensions and WebAssembly-compiled Functions.

14|3|Updated Mar 22, 2026
Search Tags:#wasm#checkout#shopify#metafields#ui-extensions#discounts#shopify-functions
One-click install
npx skills add https://github.com/tomtoto757/ecomm-ai-skills-hub --skill shopify-checkout-extensions-tomtoto757
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: shopify-checkout-extensions
Source: https://github.com/tomtoto757/ecomm-ai-skills-hub/tree/main/skills/platform-integrations-infrastructure/finsilabs/platform-shopify/shopify-checkout-extensions
Command: npx skills add https://github.com/tomtoto757/ecomm-ai-skills-hub --skill shopify-checkout-extensions-tomtoto757

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Enables merchants and developers to customize Shopify's checkout experience without forking templates by adding configurable UI blocks (upsells, gift/message fields) and server-side business logic (discounts, shipping, payment filtering) that execute safely inside Shopify's runtime.

Core Features & Use Cases

  • Checkout UI Extensions: Render merchant-configurable UI inside checkout for upsells, trust badges, gift messages, and warranty options using the @shopify/ui-extensions-react/checkout API.
  • Shopify Functions: Implement high-performance, WebAssembly-compiled functions for discounts, shipping method filtering, payment method controls, and order validation to enforce business rules at checkout.
  • Operational Guidance: Covers scaffolding with Shopify CLI, TOML configuration with api_version pinning and settings fields, local dev preview for UI extensions, and deployment steps for Functions.
  • Use Case Example: Offer a merchant-configured warranty variant as an upsell block and apply a tiered volume discount Function that activates in Admin → Discounts.

Quick Start

Scaffold a checkout UI extension and a JavaScript Function with the Shopify CLI, configure the extension settings to reference the upsell variant, build the Function to produce dist/index.wasm, and deploy using shopify app deploy.

Frequently Asked Questions about shopify-checkout-extensions

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I customize Shopify checkout with upsells and custom fields?▼

Shopify checkout customization uses UI extensions to render configurable blocks and serverless Functions to execute business rules. This approach safely modifies the checkout flow for upsells and discounts without forking templates or touching the DOM.

How do I create tiered volume discounts in Shopify checkout?▼

You create tiered volume discounts by writing Shopify Functions compiled to WebAssembly. These serverless functions execute rule-based discount logic during checkout, and the resulting discount configurations activate within the Shopify Admin Discounts panel.

Does Shopify Functions support external network calls for order validation?▼

No, Shopify Functions does not support external network calls or DOM manipulation. Functions must be compiled to WebAssembly and execute safely inside Shopify's runtime to enforce order validation, shipping, and payment filtering rules.

What is the best way to add a gift message field to Shopify checkout?▼

The best way to add a gift message field is using Checkout UI extensions. You render merchant-configurable UI blocks inside the checkout flow using the @shopify/ui-extensions-react/checkout API without altering core templates.

Can I use Shopify CLI to scaffold and deploy checkout UI extensions?▼

Yes, you can use Shopify CLI to scaffold checkout UI extensions and JavaScript Functions. You configure TOML files with api_version pinning and settings fields, build the Function to produce dist/index.wasm, and deploy using shopify app deploy.

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