Introducing our e-commerce app

The e-commerce app we will be building will be a simple online shopping application with the following features for users:

• Browsing through the products
• Adding/removing/updating the products in the cart
• Placing an order
• Modifying the shipping address
• Support for a single currency

E-commerce is a very popular domain. If we look at the features, we can divide the application into the following subdomains using bounded contexts:

• Users: This subdomain is related to users. We’ll add the users RESTful web service, which provides REST APIs for user management.
• Carts: This subdomain is related to the cart. We’ll add the carts RESTful web service, which provides REST APIs for cart management. Users can perform CRUD operations on cart items.
• Products: This subdomain is related to the products catalog. We’ll add the products RESTful web service, which provides REST APIs to search and retrieve the products.
• Orders: This subdomain is related to orders. We’ll add the orders RESTful web service, which provides REST APIs for users to place orders.
• Payments: This subdomain is related to payments. We’ll add the payments RESTful web service, which provides REST APIs for payment processing.
• Shippings: This subdomain is related to shipping. We’ll add the shippings RESTful web service, which provides REST APIs for order tracking and shipping.

Here’s a visual representation of our app’s architecture:

Figure 1.1 – The e-commerce app architecture

We’ll implement a RESTful web service for each of the subdomains. We’ll keep the implementation simple, and we will focus on learning these concepts throughout this book.