How would you design a high-scale distributed order management system using Java microservices?

A distributed order system uses microservices for order, inventory, payment, and delivery with eventual consistency via messaging.

The architecture includes API Gateway, Order Service, Inventory Service, Payment Service, and Shipping Service. Communication is event-driven using Kafka or RabbitMQ. Saga pattern ensures distributed transaction consistency. Each service owns its database (database-per-service pattern). Idempotency and retry mechanisms are essential.