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.

Payment: This subdomain is related to payments. We'll add the payment RESTful web service, which provides REST APIs for payment processing.

Shipping: This subdomain is related to shipping. We'll add the shipping RESTful web service, which provides REST APIs for order tracking and shipping.