code: def create(self, unique_name, default_ttl=values.unset,
                 callback_url=values.unset, geo_match_level=values.unset,
                 number_selection_behavior=values.unset,
                 intercept_callback_url=values.unset,
                 out_of_session_callback_url=values.unset,
                 chat_instance_sid=values.unset):
          
          data = values.of({
              'UniqueName': unique_name,
              'DefaultTtl': default_ttl,
              'CallbackUrl': callback_url,
              'GeoMatchLevel': geo_match_level,
              'NumberSelectionBehavior': number_selection_behavior,
              'InterceptCallbackUrl': intercept_callback_url,
              'OutOfSessionCallbackUrl': out_of_session_callback_url,
              'ChatInstanceSid': chat_instance_sid,
          })
  
          payload = self._version.create(
              'POST',
              self._uri,
              data=data,
          )
  
          return ServiceInstance(self._version, payload, )
docs: Create a new ServiceInstance
  
          :param unicode unique_name: An application-defined string that uniquely identifies the resource
          :param unicode default_ttl: Default TTL for a Session, in seconds
          :param unicode callback_url: The URL we should call when the interaction status changes
          :param ServiceInstance.GeoMatchLevel geo_match_level: Where a proxy number must be located relative to the participant identifier
          :param ServiceInstance.NumberSelectionBehavior number_selection_behavior: The preference for Proxy Number selection for the Service instance
          :param unicode intercept_callback_url: The URL we call on each interaction
          :param unicode out_of_session_callback_url: The URL we call when an inbound call or SMS action occurs on a closed or non-existent Session
          :param unicode chat_instance_sid: The SID of the Chat Service Instance
  
          :returns: Newly created ServiceInstance
          :rtype: twilio.rest.proxy.v1.service.ServiceInstance