Let's design an Order Management System (OMS). Imagine you're building the core engine that powers the order processing for a large e-commerce platform or a sophisticated financial trading system. This isn't about UI or external integrations; it's about the internal architecture.

The system needs to handle the creation, modification, and fulfillment of orders. Key to a robust OMS is its ability to handle various order types (e.g., market orders, limit orders, pre-orders), apply discounts, manage inventory, and process payments while maintaining data consistency and allowing for future extensions. Think of handling orders like assembling a product on a highly automated assembly line; each step needs to be clearly defined and efficiently executed.

Requirements