def response
      response = ::RestClient.post( Pxpay::Base.pxpay_request_url,  self.post )
      return ::Pxpay::Notification.new( response )
    end
def response
      response = ::RestClient.post( Pxpay::Base.pxpay_request_url,  self.post )
      return ::Pxpay::Notification.new( response )
    end
Create a new Payment Express response object by passing in the return parameters provided to the success/failure URL
 Retrieving the transaction details from Payment Express as an instance of Pxpay::Notification