[keycloak-dev] Keycloak Client Provisioning Notifications.

Hello there, are there any plans to provide a way to let client applications know of new users before they actually try to login? This could be used for triggering on-boarding mechanisms like e.g. preparing a user environment (e.g. a tenant) for a particular user. I was thinking of a mechanism like web-hooks, as github and many other services use in similar scenarios, where you could send a HTTP POST requests to the client application in case of a new user was registered in keycloak that was granted access to that particular application and potentially others as well. The POST request could contain some user data like: login, email, userid, client roles, perhaps for multiple clients etc. This would help client applications to associate a prepared environment with the actual user from keycloak. The intention is to keep an on-boarding experience fast as possible for the user by doing some preprocessing as early as possible. There is already a similar functionality to propagate logout events to client admin URL. Perhaps this could also be used for this - just send user created / user update / user deleted events to this endpoints as well. Perhaps with keeping track whether the clients acknowledged the updated via a HTTP 200 response-status with a retry with some back-off strategy otherwise. One often uses JMS topics for those scenarious but I think web-hooks would be a bit easier here. Cheers, Thomas