def __init__(self, version, payload, installed_add_on_sid, sid=None):
super(InstalledAddOnExtensionInstance, self).__init__(version)<EOL>self._properties = {<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT>': payload['<STR_LIT>'],<EOL>'<STR_LIT:url>': payload['<STR_LIT:url>'],<EOL>}<EOL>self._context = None<EOL>self._solution = {<EOL>'<STR_LIT>': installed_add_on_sid,<EOL>'<STR_LIT>': sid or self._properties['<STR_LIT>'],<EOL>}<EOL>
Initialize the InstalledAddOnExtensionInstance

: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