    public static function isExist($token){
        $json = Options::get('tokens');
        $tokens = json_decode($json, true);
        if(array_key_exists($token, $tokens)){
            $call = true;
        }else{
            $call = false;
        }
        return $call;
    }
The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.