Individual skill

shopify-functions

Build Shopify Functions for custom discount, payment, and delivery logic in a WASM sandbox. Use when creating custom discount rules, payment customizations, delivery options, or cart transformations that run server-side at checkout. Trigger with phrases like "shopify functions", "shopify discounts", "shopify wasm", "custom discount function", "shopify checkout customization".

skills/.curated/shopify-functions/SKILL.md

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Repository stars (not skill ratings): 2,916
Repository last updated: Nov 12, 2026
License: MIT

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SKILL.mdcore · 5,223 bytes
references/function-types.mddoc · 3,041 bytes
references/input-output-schemas.mddoc · 3,603 bytes
references/wasm-constraints.mddoc · 3,170 bytes

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# Shopify Functions

## Overview

Shopify Functions execute custom business logic in a WebAssembly sandbox at checkout: discounts, payment filtering, delivery customization, and cart transforms. They run server-side with strict constraints (11ms execution, 1MB memory, no network access) and replace Shopify Scripts.

## Prerequisites

- Shopify CLI 3.x+ installed (`npm install -g @shopify/cli`)
- Shopify Partners account with a development store
- App configured for the target function API type

## Instructions

### Step 1: Configure the Function Extension