code: def create(self, body=values.unset, media_url=values.unset):
          
          data = values.of({'Body': body, 'MediaUrl': serialize.map(media_url, lambda e: e), })
  
          payload = self._version.create(
              'POST',
              self._uri,
              data=data,
          )
  
          return MessageInteractionInstance(
              self._version,
              payload,
              service_sid=self._solution['service_sid'],
              session_sid=self._solution['session_sid'],
              participant_sid=self._solution['participant_sid'],
          )
docs: Create a new MessageInteractionInstance
  
          :param unicode body: Message body
          :param unicode media_url: Reserved
  
          :returns: Newly created MessageInteractionInstance
          :rtype: twilio.rest.proxy.v1.service.session.participant.message_interaction.MessageInteractionInstance