'Fetch a InstalledAddOnExtensionInstance
:returns: Fetched InstalledAddOnExtensionInstance
:rtype: twilio.rest.preview.marketplace.installed_add_on.installed_add_on_extension.InstalledAddOnExtensionInstance'

def fetch(self):

    params = values.of({})
    payload = self._version.fetch('GET', self._uri, params=params)
    return InstalledAddOnExtensionInstance(self._version, payload, installed_add_on_sid=self._solution['installed_add_on_sid'], sid=self._solution['sid'])
