def __call__(self, sid):
return InstalledAddOnExtensionContext(<EOL>self._version,<EOL>installed_add_on_sid=self._solution['<STR_LIT>'],<EOL>sid=sid,<EOL>)<EOL>
Constructs a InstalledAddOnExtensionContext

:param sid: The unique Extension Sid

:returns: twilio.rest.preview.marketplace.installed_add_on.installed_add_on_extension.InstalledAddOnExtensionContext
:rtype: twilio.rest.preview.marketplace.installed_add_on.installed_add_on_extension.InstalledAddOnExtensionContext