this.rb

class PaypalNotificationsController < ApplicationController

  def ipn_notify
  
    if PayPal::SDK::Core::API::IPN.valid?(request.raw_post)
      #logger.info("IPN message: VERIFIED")
      puts "\n\n V E R I F I E D \n\n\n"
      render :text => "VERIFIED"
    else
      #logger.info("IPN message: INVALID")
      render :text => "INVALID"
    end    

  end
end