3 months ago I started to modify the Invite App and had no idea how extensive the changes would be. Now I think I've come to a useful conclusion and guess that the code will be available this month if the developers agree. The changes are quite drastic, but I've taken care to preserve the existing functionality as well as to extend the access logic when registering new users. In addition, some special features have been added in the design of the flow logic (more ajax functionality), the handling of JS and templates, the interaction with the users (messages, error checking and handling) and the internationalization. I will explain and justify each of these points in the developer forum. In some things I still need the help of the community, e.g. with the foreign language formulation of some template texts. And if someone runs his instance with Postgresql, a feedback would be very helpful. Although my development is based on Hubzilla 4.7.2 (prod), it can be used with dev and with Zap dev/master. A file would still require work on Zap, but is not a challenge.