Smans hosting service includes not only users administration through the menu, "Users". There are also ready Java classes. You need to see source code. For example, for billing and paid accounts the "PayServlet", "SubscriptServlet", and "AdminBServlet" servlets are necessary. Automatic account cancellation is executed by means of "CancelServlet" servlet. There are other servlets such as "RegisterServlet" for free user registration, "StoreServlet" for file saving and deleting of temporal files, "EmailServlet" for Web-email.