E-commerce API Development

We build both RESTful and GraphQL APIs depending on your use case. REST is ideal for straightforward CRUD operations, webhook integrations, and third-party consumption where simplicity and cachability matter. GraphQL excels when your frontends need flexible queries — fetching exactly the product fields they need, resolving relationships in a single request, and avoiding the over-fetching that plagues REST endpoints serving multiple consumers.

Many of our clients use both. REST powers webhooks, external integrations, and admin operations. GraphQL serves the storefront where page-specific queries reduce network requests and improve load time. Both share the same business logic layer, ensuring consistency regardless of how data is accessed.

Our e-commerce APIs cover every operation your systems need: product catalog management with variant and option support, inventory queries and updates, cart operations with promotional pricing, checkout with multi-step validation, payment processing, order lifecycle management, customer account operations, and webhook subscriptions for event-driven integrations.

Every endpoint follows consistent patterns — predictable URL structures, standard HTTP status codes, descriptive error messages with error codes your client can handle programmatically, and pagination that works efficiently even on large result sets. We document everything using OpenAPI specifications that generate interactive documentation, client SDKs, and mock servers automatically.

Rate limiting, authentication, and authorization are built into every endpoint. Different API consumers get different rate limits and permission scopes based on their role — your storefront has read-heavy access, your admin panel has write access, and third-party integrations have scoped access limited to the resources they need.

E-commerce APIs must be fast and always available. We implement multi-layer caching — CDN-level caching for catalog data, application-level caching for computed results like pricing and availability, and database query caching for complex aggregations. Cache invalidation is event-driven so data is always fresh without waiting for TTL expiry.

Database queries are optimized with proper indexing, connection pooling, and read replicas for high-traffic endpoints. We load-test every API under realistic conditions — not just average traffic, but the spike patterns that occur during flash sales, marketing campaigns, and holiday seasons.

APIs evolve as your business grows. We implement versioning strategies that let you ship new API features without breaking existing integrations. Non-breaking changes — new fields, new optional parameters, new endpoints — are added to the current version. Breaking changes go into a new version with a documented migration path and a deprecation timeline that gives consumers time to update.

Changelog documentation tracks every API change with the date, version, and detailed description of what changed. Automated compatibility testing ensures that new releases do not break existing API contracts. Consumer health monitoring shows which API versions and endpoints your integrations are actively using, so you know when it is safe to retire deprecated versions.