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

def fetch(self):

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