Use this skill when building custom headless storefronts that call Salesforce Commerce API (SCAPI) — including Shopper API authentication with SLAS OAuth2 JWT tokens, integrating Commerce SDK React hooks, wiring Shopper Basket/Checkout APIs, and handling SCAPI-specific load-shedding and caching behavior. NOT for standard LWR storefront configuration, declarative Experience Builder layouts, legacy OCAPI integrations, or architecture-level headless decisions — use admin/headless-commerce-architecture for pattern selection.