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<tt>'''''Extension string'''''</tt> - string, used for loading user key to the app engine. This sting contains encrypted user key and some metadata.
You can get <tt>''extension string''</tt> via <tt>''createUserKey''</tt> method from [[Reseller_API#createUserKey|Reseller]] or [[Developer_API#createUserKey|Developer API]]. To load this string into the app engine use [[Engine_Service_API#load_extension|load_extension]] method from [[Engine_Service_API|Engine service API]].