I need to authenticate self-service users, but don't want to use the self-service login page (I want to create a new page that accepts self-service username and password).

I don't want to create a user database to authenticate the self-service users as suggested in other posts, and I also don't want to use a single password solution as suggested in other posts.

From the documentation this may be done through LoginScopeHeader, but I can't find any code samples that do that.

Does anybody have a good sample that authenticates an existing self-service user?  (using LoginScopeHeader or not)