code: def update(self, configuration=values.unset, unique_name=values.unset):
          
          data = values.of({'Configuration': serialize.object(configuration), 'UniqueName': unique_name, })
  
          payload = self._version.update(
              'POST',
              self._uri,
              data=data,
          )
  
          return InstalledAddOnInstance(self._version, payload, sid=self._solution['sid'], )
docs: Update the InstalledAddOnInstance
  
          :param dict configuration: The JSON object representing the configuration
          :param unicode unique_name: The string that uniquely identifies this Add-on installation
  
          :returns: Updated InstalledAddOnInstance
          :rtype: twilio.rest.preview.marketplace.installed_add_on.InstalledAddOnInstance