Spring Boot Webhook Hub Uses Strategy Pattern and Sub-Strategies for Scalable Event Handling

A developer describes a production webhook hub built with Spring Boot that receives requests from about 20 third-party platforms, handling more than 25 million requests per month. Each platform differs in payload format, verification method, and event types, which made a single controller with a switch statement impractical. The solution applies the Strategy Pattern, with one strategy per platform and a second level of sub-strategies per event that can run in parallel. Spring's collection injection links the two levels, so new platforms and events can be added as new classes without modifying existing code. The approach also keeps each strategy and follow-up action independently testable and removable.