After registering, the app allows you to use several service offerings around the clock. This includes, among other things, the simple and secure transmission of messages to Merck BKK, as well as the secure transmission of certificates of incapacity or the photograph for the electronic health card. Also, the transfer of other documents is possible. In addition, the app allows you to change your personal information such as address or bank details and to use other services, such as: the application for a membership certificate.