167     private $serviceAccountIdentity;  variable in Google\\Auth\\Credentials\\GCECredentials
176      * @param string $serviceAccountIdentity [optional] Specify a service
184         $serviceAccountIdentity = null  argument
194         $tokenUri = self::getTokenUri($serviceAccountIdentity);
204             $tokenUri = self::getIdTokenUri($serviceAccountIdentity);
211         $this->serviceAccountIdentity = $serviceAccountIdentity;
217      * @param string $serviceAccountIdentity [optional] Specify a service
221     public static function getTokenUri($serviceAccountIdentity = null)  argument
248         if ($serviceAccountIdentity) {
251                 '/' . $serviceAccountIdentity . '/',
262      * @param string $serviceAccountIdentity [optional] Specify a service
266     private static function getIdTokenUri($serviceAccountIdentity = null)  argument