Context An e-commerce platform must decouple its order, inventory, and notification services so they can scale and deploy independently. The Problem All three services are tightly coupled via direct HTTP calls. A failure in the notification service blocks order processing. Constraints Publish domain events (OrderPlaced, StockReserved) to RabbitMQ exchanges. Each consuming service subscribes to relevant events via dedicated queues. Implement a dead-letter exchange for failed processing. Ensure at-least-once delivery with idempotent consumers. Expected Deliverable A Node.js event-driven architecture with RabbitMQ, demonstrating publish-subscribe between three services, dead-letter handling, and idempotent event consumers.