The Purchases Trasactions API was developed at the end of 2023 and is a production-ready Spring Boot 3 project using Spring Reactive WebFlux. It’s designed for reactive, non-blocking transaction processing and exchange rate calculations with persistence, providing high-performance and scalable solutions for financial operations.

This implementation caches data periodically from the US Treasury Department’s Exchange Rates API to a local database for converting purchase transactions values from USD to other currencies.

Features

• Java 21 LTS
• Maven
• Spring Boot 3 with Spring 6
• Spring Data R2DBC
• H2 Local In Memory Embedded Database
• MySQL Database for Production
• Automated Unit Tests
• VCS on Github
• Spring Actuator with Custom Health Check
• Spring Profile Support (application.yml and application-dev.yml)
• Rate Limiter and Retries with Resilience4J
• Spring Webflux
• Swagger with OpenAPI 3 Standard
• Github Actions CI with “Build Pass” Badge
• Javadocs
• Classes Diagram
• Readme