Overview

The Shopping domain is responsible for everything between browsing and buying — the shopping cart and the promotions applied to it. It is split into two systems:

Cart System

System of record for shopping carts — add, remove and check out items.

Promotion System

Calculates the discounts and promotions that apply to a cart.

How the systems work together

The Cart System owns the customer’s cart and the checkout flow. When pricing a cart, it asks the Promotion System to calculate the discounts that apply. When the customer checks out, the Cart System publishes an event the rest of the business reacts to.

System Diagram

The systems in this domain, how they relate, and the people who interact with them.

Resource Diagram

The components that make up this domain.