authorizations_controller.rb

class AuthorizationsController < ApplicationController
  before_filter :require_user, :only => [:destroy]

  def create
    omniauth = request.env['omniauth.auth'] #this is where you get all the data from your provider through omniauth
    @auth = Authorization.find_from_hash(omniauth)
    if omniauth['provider'] == 'stripe_platform'
      current_user.stripe_token = omniauth[:credentials][:token]
      current_user.stripe_publishable_key = omniauth[:extra][:raw_info][:stripe_publishable_key]
      current_user.save
      redirect_to stripe_splash_path(omniauth: omniauth)
    else
      if current_user
        #flash[:notice] = "Successfully added #{omniauth['provider']} authentication"
        #Add an auth to existing user
        current_user.authorizations.create(:provider => omniauth['provider'], :uid => omniauth['uid'])
        session[:fbtoken] = omniauth['credentials']['token']
      elsif @auth
        #flash[:notice] = "Welcome back #{omniauth['provider']} user"
        #User is present. Login the user with his social account
        UserSession.create(@auth.user, true) 
        session[:fbtoken] = omniauth['credentials']['token']
      else  
        @new_auth = Authorization.create_from_hash(omniauth, current_user) #Create a new user
        #flash[:notice] = "Welcome #{omniauth['provider']} user. Your account has been created."
        #Log the authorizing user in.
        UserSession.create(@new_auth.user, true) 
        session[:fbtoken] = omniauth['credentials']['token']
      end
      if !session[:original_uri].nil?
        uri = session[:original_uri]
        session[:original_uri] = nil
        redirect_to uri and return
      end
      redirect_to root_url
    end
  end
  
  def failure
    flash[:notice] = "Sorry, You din't authorize"
    redirect_to root_url
  end
  
  def destroy
    @authorization = current_user.authorizations.find(params[:id])
    flash[:notice] = "Successfully deleted #{@authorization.provider} authentication."
    @authorization.destroy
    redirect_to root_url
  end
  
  def stripe_splash
    @omniauth = params[:omniauth]
  end
end

omniauth.rb

Rails.application.config.middleware.use OmniAuth::Builder do
  if Rails.env.production?
    provider :twitter, 'xxx', 'xxx'
    provider :facebook, ENV['FACEBOOK_ID'], ENV['FACEBOOK_SECRET'], {:scope => 'publish_stream,offline_access,email'}
    provider :linked_in, 'xxx', 'xxx'
  elsif Rails.env.development?
    provider :facebook, 'xxx', 'xxx', {:scope => 'publish_stream,offline_access,email'}
  else  
    provider :facebook, 'xxx', 'xxx', {:scope => 'publish_stream,offline_access,email'}
  end
  provider :stripe_platform, 'ca_0TouMzxxx', 'sk_1yZsxxx', {:scope => 'read_write'}
end