Chapter 7: APIs and Integration Patterns

REST, GraphQL, gRPC, event-driven integration, and the patterns that govern how systems communicate. How to design APIs that survive versioning and how to choose the right integration style for each use case.

What this chapter covers

REST API design best practices and Richardson Maturity Model
GraphQL vs. REST vs. gRPC: when to use each
API versioning strategies
API gateway patterns and cross-cutting concerns
Event-driven integration and message queues
Webhook architecture and delivery guarantees
Dead letter queues and error handling patterns
Contract-first and API-first design

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