How Hyperswitch Prism Uses Classic Design Patterns to Support 100+ Payment Connectors

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Hyperswitch Prism is a stateless Rust library designed to translate a single unified payment request into the correct API call for over 100 payment processors. The engineering team behind it faced a scaling problem: each payment connector requires different URLs, HTTP methods, and data formats, making copy-paste approaches unmanageable at scale. To solve this, the team applied several well-known software design patterns, including Singleton for configuration management, Factory Method for runtime connector selection, Strategy and Adapter patterns for request and response handling, and Builder and Template Method patterns for constructing HTTP calls. The Singleton pattern ensures configuration is loaded exactly once and accessed safely across threads, while the Factory pattern maps a connector name received at runtime to the appropriate connector object. Together, these patterns allow the codebase to remain maintainable and extensible as new payment connectors are added.

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