That url is called inside /ngm/static/apps/modules/Livefyre.coffee in the doLogin: method. This part of django-comments3 is new and only used in NGM. The issue that this change addressed is that we need the MMDB id of a user to be used in creating the token that is passed to livefyre. Previously I had used request.user.pk but that resulted in the incorrect user data being displayed. Any sites that used this in the future would be required to pass in a user id from ajax call...