public function isExpired(int $tolerance) : bool
    {
        $timestamp = $this->headers->get('X-SIGNED-TIMESTAMP', '1901-01-01 12:00:00');
        $issuedAt = Carbon::parse($timestamp);

        $isValid = Helpers::verifyDateTime($timestamp, 'Y-m-d H:i:s');

        return !$isValid || Carbon::now()->diffInSeconds($issuedAt) > $tolerance;
    }