Order Management

The scenario spans an order workflow involving:

Order
  ↓
Inventory
  ↓
Payment
  ↓
Shipping
  ↓
Fulfillment

Failure scenarios

• payment failure
• inventory shortage
• duplicate order submission
• service timeout
• event loss
• duplicate events
• cancellation
• partial failure
• regional outage

Key areas:

• Saga
• Outbox
• Idempotency
• Event-driven architecture
• State machines
• Consistency
• Observability