docs: public void marshall(MessageTemplateType messageTemplateType, ProtocolMarshaller protocolMarshaller) {
  
          if (messageTemplateType == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(messageTemplateType.getSMSMessage(), SMSMESSAGE_BINDING);
              protocolMarshaller.marshall(messageTemplateType.getEmailMessage(), EMAILMESSAGE_BINDING);
              protocolMarshaller.marshall(messageTemplateType.getEmailSubject(), EMAILSUBJECT_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }