def callback(self, request, **kwargs):
        """
            Called from the Service when the user accept to activate it
            :param request: request object
            :return: callback url
            :rtype: string , path to the template
        """

        try:
            UserService.objects.filter(
                user=request.user,
                name=ServicesActivated.objects.get(name='ServiceWallabag')
            )
        except KeyError:
            return '/'

        return 'wallabag/callback.html'