Hi, I'm trying to set up XWiki with our single sign on and group management infrastructure, I've so far managed to handle SSO using CAS but I'm stuck when it comes to managing groups. The XWikiUsers are created on demand when they first log in, users belong to groups, those groups are managed outside of XWiki. My question is, what API should I use (XWikiGroupsService,XWikiRightsService?) to materialize those groups in XWiki so they appear when setting access rights on pages. Any help would be greatly appreciated. Mathias.