The IDM module is a development within the framework of the National Building Register. The task of the IDM module is to manage the user-related tasks of the OÉNY system. It manages the data of the persons registered as users, performs the logon and logoff of users through the services of the Central Identification Agent (CA) supporting government electronic services, defines and transfers the roles of users to the other modules of the system and manages the whole life cycle of user accounts. During the project, we were responsible for the further development of the module, which included the implementation of a registration option outside the KAÜ. The module was implemented using Java technology (Spring, Angular).