Koudoku plan subscription creation on user sign up

[doobee46]

I'm using koudoku to accept payment .i have listing and users .Setup koudoku gem as instructed by the guides . How i can make every user on the app enroll in a plan on sign up(i'm using devise) and send the info to stripe in the same process , the goal is to have everybody on the free plan and themselves can upgrade in their dashboard?

so far this is what i have or think it should look like and i stuck. (

1. create a function "create_subscription" in the subscription model that take parameters from the subscription params hash

    class Subscription < ActiveRecord::Base
    include Koudoku::Subscription

    belongs_to :user
   belongs_to :coupon

  def create_subscription
     subscription = subscription.new 
     plan_id = subscription.plan.first.id
     subscription.subscription_owner = @owner_id
     subscription.save
      subscription
   end  

end

2)call the function in the devise registrations controller

  class Users::RegistrationsController < Devise::RegistrationsController
include ApplicationHelper

 def create
   super 
     @user.create_subscription()
      # Sends email to user when user is created.
      TimarcheMailer.welcome_email(@user).deliver 
   end
end 

in the logs after user creation only one parameter(user_id) was saved in the subscriptions tables

  SQL (16.0ms)  INSERT INTO "subscriptions" ("created_at", "updated_at",   "user_id") VALUES  (?, ?, ?)  [["created_at", "2015-05-29 07:26:24.993908"], [
 "updated_at", "2015-05-29 07:26:24.993908"], ["user_id", 55]] 

so far none of the users created have an associated enrollment . any pointers will be helpful.

PS.it's not really a gem issue it's implementation , always posted in stackoverflow. i'm trying to get the answers