public static function getSignContent($data): string
    {
        $buff = '';

        foreach ($data as $k => $v) {
            $buff .= ($k != 'sign' && $v != '' && !is_array($v)) ? $k.'='.$v.'&' : '';
        }

        Log::debug('Wechat Generate Sign Content Before Trim', [$data, $buff]);

        return trim($buff, '&');
    }