private function getAppKey(): string
    {
        $appUUID = $this
            ->getRepositoryReference()
            ->getAppUUID();

        return $appUUID instanceof AppUUID
            ? $appUUID->getId()
            : '';
    }
private function getAppKey(): string
    {
        $appUUID = $this
            ->getRepositoryReference()
            ->getAppUUID();

        return $appUUID instanceof AppUUID
            ? $appUUID->getId()
            : '';
    }
private function getAppKey ( ) : string { $ appUUID = $ this -> getRepositoryReference ( ) -> getAppUUID ( ) ; return $ appUUID instanceof AppUUID ? $ appUUID -> getId ( ) : '' ; }
Get app position by credentials.

@return string
Get app position by credentials .