Setting the scene

In this section, we will outline a scenario using a fictitious company. Domain-driven design is all about solving business invariants in a specific context, and I hope this example will help reinforce that.

CoffeeCo is a national coffee shop chain. They experienced rapid growth in the last year and have opened 50 new stores. Each store sells coffee and coffee-related accessories, as well as store-specific drinks. Stores often have individual offers, but national marketing campaigns are often run, which influence the price of an item too.

CoffeeCo recently launched a loyalty program called CoffeeBux, which allows customers to get 1 free drink for every 10 they purchase. It doesn’t matter which store they purchase a drink at or which they redeem it at.

CoffeeCo has been thinking of launching an online store. They are also considering a monthly subscription that allows purchasers to get unlimited coffee every month, as well as a discount on other drinks...