Authlogic Single Access Token-Web Service Iphone app

Hi all          I am working on Rails 2 application where i need to provide web services for iphone app. I am using authlogic gem for authentication.For web services i am using single access token(user_credentials="XXXXXXXXX").

    Every thing is working fine except session[:something] for API call.This session variable is not working for API call.This session variable is not persisting.

     Is anyone used authlogic for API call on Rails application.Please help me out this.

                               Thank you..