Cart Service Microservice

Cart Service Reactive Architecture:

🌐 Frontend Application (Vercel)
    └── https://ecommerce-app-omega-two-64.vercel.app
    │   ├── React Cart Context (State Management)
    │   ├── Real-time Cart Updates
    │   └── Cross-device Synchronization
                    ↓
🔗 API Gateway (Google Kubernetes Engine)
    └── https://34.95.5.30.nip.io
                    ↓
🛒 CART SERVICE (Heroku Platform)
    ├── ☕ Java 17 + Spring Boot 3.x
    ├── 🔄 Spring WebFlux (Reactive Programming)
    ├── 🔒 JWT Authentication & Authorization
    ├── 📊 OpenAPI 3.0 Documentation
    ├── 🎯 Cart Session Management
    └── ⚡ Ultra-fast Response Times (<100ms)
                    ↓
💾 Redis Session Storage (Upstash)
    ├── 🚀 Sub-millisecond latency operations
    ├── 🌐 Global edge network deployment
    ├── 🔄 Automatic cart persistence & recovery
    ├── 📱 Cross-device cart synchronization
    └── ⏰ TTL-based session expiration
                    ↓
🔗 Integration Points:
    ├── 📦 Product Service (Item validation & pricing)
    ├── 📋 Order Service (Cart-to-order conversion)
    ├── 👤 User Service (Authentication & authorization)
    └── 🌐 Frontend (Real-time cart state management)
                    ↓
🚀 Deployment Pipeline:
    ├── GitHub Actions (Automated CI/CD)
    ├── Docker Hub (Container registry)
    ├── Heroku Container Registry
    └── Production Health Monitoring