def payment_orders
      xml do |xml|
        xml.css("paymentOrdersResult > paymentOrders > paymentOrder").map do |node|
          SubscriptionPaymentOrder.load_from_xml(node)
        end
      end
    end
def payment_orders
      xml do |xml|
        xml.css("paymentOrdersResult > paymentOrders > paymentOrder").map do |node|
          SubscriptionPaymentOrder.load_from_xml(node)
        end
      end
    end
Return the list of subscription payment orders.
 Each item will be wrapped in a PagSeguro::SubscriptionPaymentOrder instance.