The user management service is supposed to perform user-specific operations. These can include login, logout, organizing user details, user address, user preferences about payment, and so on. Login/logout can be taken as a separate service, such as an authentication service. Here, we are talking about a hypothetical service, so we are adding two services together. The reader can make their own decision to turn one service into two when they deal with their own services. However, we would like to recommend here that, until you have a problem with latency or performance, don't break your services further.