Shopify Storefront API — Headless Commerce

Procedural guide for building headless storefronts against the Shopify Storefront API (GraphQL). Covers cart, checkout, and customer account operations. For product data, collections, and pages use the Frontic skill instead.

Architecture

Frontic Client    →  Product data, collections, pages, search (read)
Storefront API    →  Cart, checkout, customer accounts (write/session)

The Storefront API is a GraphQL API. All operations are mutations or queries sent to a single endpoint.

API Endpoint & Authentication

POST https://{store}.myshopify.com/api/{version}/graphql.json