'Access the extensions
:returns: twilio.rest.preview.marketplace.installed_add_on.installed_add_on_extension.InstalledAddOnExtensionList
:rtype: twilio.rest.preview.marketplace.installed_add_on.installed_add_on_extension.InstalledAddOnExtensionList'

@property
def extensions(self):

    if (self._extensions is None):
        self._extensions = InstalledAddOnExtensionList(self._version, installed_add_on_sid=self._solution['sid'])
    return self._extensions
