code: def dependent_hosted_number_orders(self):
          
          if self._dependent_hosted_number_orders is None:
              self._dependent_hosted_number_orders = DependentHostedNumberOrderList(
                  self._version,
                  signing_document_sid=self._solution['sid'],
              )
          return self._dependent_hosted_number_orders
docs: Access the dependent_hosted_number_orders
  
          :returns: twilio.rest.preview.hosted_numbers.authorization_document.dependent_hosted_number_order.DependentHostedNumberOrderList
          :rtype: twilio.rest.preview.hosted_numbers.authorization_document.dependent_hosted_number_order.DependentHostedNumberOrderList