All messages, push, text or email, can be sent to groups of receipients. A group might be one person only(!), all persons with a digital member card, all who should pay the fee, all who have paid the fee and all who might be interested to buy a member card.
A special type of group is the sendlist, which can be created temporarily (or permanentely). Examples of use here are sports clubs who very easily create lists for their different activities for children. Parents and other interested sign on to the list in the app and get online messages from the club. Club officials can send immediate push, text or mail from their app about changes in the planning and other important information.