code: def get_instance(self, payload):
          
          return InstalledAddOnExtensionInstance(
              self._version,
              payload,
              installed_add_on_sid=self._solution['installed_add_on_sid'],
          )
docs: Build an instance of InstalledAddOnExtensionInstance
  
          :param dict payload: Payload response from the API
  
          :returns: twilio.rest.preview.marketplace.installed_add_on.installed_add_on_extension.InstalledAddOnExtensionInstance
          :rtype: twilio.rest.preview.marketplace.installed_add_on.installed_add_on_extension.InstalledAddOnExtensionInstance