public function getCacheKey()
    {
        if (is_null($this->cacheKey)) {
            return $this->prefix.$this->appKey;
        }

        return $this->cacheKey;
    }
public function getCacheKey()
    {
        if (is_null($this->cacheKey)) {
            return $this->prefix.$this->appKey;
        }

        return $this->cacheKey;
    }
public function getCacheKey ( ) { if ( is_null ( $ this -> cacheKey ) ) { return $ this -> prefix . $ this -> appKey ; } return $ this -> cacheKey ; }
Get access token cache key.

@return string $this->cacheKey
Get access token cache key .