Octopus Payment Gateway Microservice

Overview

Architected and developed a production-ready payment gateway microservice that extracts and generalizes payment processing logic into a reusable service. Features comprehensive security infrastructure including APIP-compliant authentication, AES-256-GCM encryption, and automated webhook delivery with retry logic.

What I Built

• Designed and implemented complete cryptographic service with SHA-256 hashing and AES-256-GCM encryption
• Built HMAC-SHA256 request signature system with replay attack prevention
• Created merchant management APIs with key rotation and profile management
• Implemented async webhook delivery system with retry logic and failure handling
• Developed comprehensive test suite with unit and integration tests

Key Achievements

• +Contributed 3,680+ lines of production code in 2 weeks
• +APIP-compliant multi-tenant architecture
• +Automatic API key rotation with graceful expiration
• +Production-ready with complete security infrastructure

Technologies Used

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