Finance Service (v1.0.0)
Orchestrates order processing and financial transactions for BookWorm using the Saga pattern
Overview
The Finance Service is the orchestration engine for BookWorm’s order processing workflow. It implements the Saga pattern to manage distributed transactions across multiple services, ensuring data consistency and handling complex failure scenarios gracefully.
Key Responsibilities
- Payment Processing: Integrate with payment gateways
- Saga Orchestration: Coordinate multi-service transactions
- State Management: Track order lifecycle states
- Compensation Logic: Handle rollback scenarios
- Financial Reporting: Generate transaction records
🏗️ Architecture
Component Diagram
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State Machine Workflow
The Finance Service implements a state machine to manage the order lifecycle:
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📊 Core Features
| Feature | Description | SLA |
|---|---|---|
| Payment Processing | Integration with multiple payment providers (Stripe, PayPal) | 99.99% uptime |
| Saga Orchestration | Distributed transaction management with automatic compensation | < 5s completion |
| Idempotency | Duplicate request handling for financial operations | 100% accuracy |
| Audit Trail | Complete transaction history with event sourcing | Permanent retention |
| Multi-Currency | Support for 50+ currencies with real-time conversion | 99.9% accuracy |
| Fraud Detection | ML-based transaction risk assessment | < 100ms response |
🔒 Security & Compliance
Security Measures
- PCI DSS Level 1 compliance for payment data
- End-to-end encryption for sensitive information
- Token vault for payment method storage
- Rate limiting on payment endpoints
- Fraud detection algorithms
Compliance Features
- GDPR: Data privacy and right to be forgotten
- SOC 2: Security and availability controls
- ISO 27001: Information security management
- Audit logging: Immutable transaction records
📈 Performance & Scalability
Performance Metrics
| Metric | Target | Current |
|---|---|---|
| Throughput | 1000 TPS | 850 TPS |
| P50 Latency | < 50ms | 42ms |
| P95 Latency | < 200ms | 185ms |
| P99 Latency | < 500ms | 450ms |
| Error Rate | < 0.1% | 0.08% |
Scaling Strategy
- Horizontal scaling: Kubernetes HPA based on CPU/memory
- Database sharding: By customer region
- Cache strategy: Redis cluster with automatic failover
- Queue partitioning: Service Bus topic partitions
Architecture diagram
🏢 Infrastructure
The Finance service is deployed on Microsoft Azure, leveraging Azure Database for PostgreSQL as the primary data store.
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🔍 Monitoring & Observability
Dashboards
Business Metrics
- Transaction volume and value
- Success/failure rates
- Payment method distribution
- Geographic distribution
Technical Metrics
- Service health and uptime
- Response time percentiles
- Error rates by type
- Resource utilization
Saga Metrics
- Active saga instances
- State transition times
- Compensation rates
- Timeout occurrences
Alerts
- name: HighPaymentFailureRate
condition: failure_rate > 5%
severity: critical
- name: SagaTimeout
condition: saga_duration > 60s
severity: warning
- name: PaymentGatewayDown
condition: gateway_health == unhealthy
severity: critical