Storefront API

Overview

Storefront API is an API interface concept that exposes customer-facing commerce data and actions for building web, mobile, headless, or custom shopping experiences. Access is often broader than an internal API but narrower and more controlled than administrative commerce interfaces. Providers should enforce field and resource authorization, query complexity limits, rate controls, and safe publication rules. Data handled by Storefront API should use documented types, units, timestamp rules, nullable fields, and enum behavior to prevent silent interpretation errors.

Clients should treat displayed data as provisional, protect customer sessions, and let the server recalculate totals and payment intent before checkout completion. Storefront prices, inventory, discounts, and cart totals are not authoritative until validated by the commerce backend. Overly broad queries can expose unpublished data or create denial-of-service cost. Testing Storefront API should cover malformed input, denied access, rate limits, timeouts, duplicates, asynchronous completion, and version changes.

An audit trail for Storefront API should link the contract and client version, principal, request identifier, sanitized payload evidence, response, callbacks, retries, overrides, provider references, and final state. It can provide products, collections, prices, availability, carts, checkout sessions, customer accounts, and localization. Public client use means tokens and requests can be inspected and modified. The Storefront API owner should publish stable error semantics and guidance on whether correction, retry, status lookup, or escalation is appropriate.

For Storefront API, the application should preserve a correlation path from request construction through response, asynchronous completion, and final business state.

A successful transport result from Storefront API should not be interpreted beyond the exact API state documented by the provider.