code: def get_instance(self, payload):
          
          return FunctionVersionInstance(
              self._version,
              payload,
              service_sid=self._solution['service_sid'],
              function_sid=self._solution['function_sid'],
          )
docs: Build an instance of FunctionVersionInstance
  
          :param dict payload: Payload response from the API
  
          :returns: twilio.rest.serverless.v1.service.function.function_version.FunctionVersionInstance
          :rtype: twilio.rest.serverless.v1.service.function.function_version.FunctionVersionInstance