# File lib/casclient/client.rb, line 123
    def login_to_service(credentials, service)
      lt = request_login_ticket
      
      data = credentials.merge(
        :lt => lt,
        :service => service 
      )
      
      res = submit_data_to_cas(login_url, data)
      CASClient::LoginResponse.new(res)
    end