docs: public void marshall(SendUsersMessageRequest sendUsersMessageRequest, ProtocolMarshaller protocolMarshaller) {
  
          if (sendUsersMessageRequest == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(sendUsersMessageRequest.getContext(), CONTEXT_BINDING);
              protocolMarshaller.marshall(sendUsersMessageRequest.getMessageConfiguration(), MESSAGECONFIGURATION_BINDING);
              protocolMarshaller.marshall(sendUsersMessageRequest.getTraceId(), TRACEID_BINDING);
              protocolMarshaller.marshall(sendUsersMessageRequest.getUsers(), USERS_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }