Ruby on Rails

Hi i was following this link http://www.funonrails.com/search?q=paypal&imageField.x=0&imageField.y=0&max-results=10 for PayPal integration in the process i got this error

undefined local variable or method `pay_bill_url' for #<#<Class:0x927b3f8>:0x92794b8>


View Name:create
<%= form_for @payment ||= Payment.new, :url => pay_bill_url, :html => {:id => :payForm} do |p|    %>
 <%=p.text_field :amount%>
 <%=p.submit 'Pay'%>
<% end %>

Controller Name: billing


class BillingController < ApplicationController
  before_filter :get_order, :only => [:checkout, :paypal, :thank_you]


 def new
    @payment = Payment.new params[:payment]
    if @payment.save
      ## Paypal Checkout page
      redirect_to billing_url
    else
      render :action => :new
    end
 end


  def create
    
  end

  # ASSUMPTION
  # order is valid i.e. amount is entered

  def checkout
    response = @order.setup_purchase(:return_url => confirm_paypal_url(@order), :cancel_return_url => root_url)
    redirect_to @order.redirect_url_for(response.token)
  end

  ## CALL BACK
   def paypal
     @order = @order.purchase(:token => params[:token], :payer_id => params[:PayerID], :ip => request.remote_ip)
     @order.save redirect_to thank_you_billing_url(@order)
   end

   private
   def get_order
     @order = Payment.find_by_id(params[:id])
     @order && @order.valid? || invalid_url
   end




end

Routes:
match 'billing/create' => 'billing#create'
## Callback URL
 match '/billing/paypal/:id/confirm', :to => 'billing#paypal', :as => :confirm_paypal
 ## Create payment
  #match '/billing', :to => 'billing#create', :as => :pay_bill
  ### Request URL
  match '/billing/paypal/:id', :to => 'billing#checkout', :as => :billing
  match '/billing/thank_you/:id', :to => 'billing#checkout', :as => :billing_thank_you


Cheers

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