gistfile1.txt

  def notify
    notify = Paypal::Notification.new(request.raw_post)
    enrollment = Enrollment.find(notify.item_id)

    if notify.acknowledge
      @payment = Payment.find_by_confirmation(notify.transaction_id) ||
        enrollment.invoice.payments.create(:amount => notify.amount,
          :payment_method => 'paypal', :confirmation => notify.transaction_id,
          :description => notify.params['item_name'], :status => notify.status,
          :test => notify.test?)
      begin
        if notify.complete?
          @payment.status = notify.status
        else
          logger.error("Failed to verify Paypal's notification, please investigate")
        end
      rescue => e
        @payment.status = 'Error'
        raise
      ensure
        @payment.save
      end
    end
    render :nothing => true
  end