Как заставить freekassa код php делать запросы в mysql (изменять, добавлять данные), я сколько не пытался бесполезно.

 case ID_FK: 
			{ 
	$payment = new payment_fk; 
	$params = $_REQUEST; 
		$sum = $params['fk_oa']; 
		$params['fk_o'] = date ('H:i:s'); 
        $sign = md5($cfg['payments'][ID_FK - 1]['project_id'].':'.$params['fk_oa'].':'.$cfg['payments'][ID_FK - 1]['key1'].':'.$params['fk_currency'].':'.$params['fk_o']); 
  
 
        header("Location: https://pay.freekassa.ru/?m={$cfg['payments'][ID_FK - 1]['project_id']}&oa={$params['fk_oa']}&o={$params['fk_o']}&s={$sign}¤cy={$params['fk_currency']}&us_account={$params['fk_us_shpuserid']}"); 
 
	$valid_ip = false; 
        if (isset($_SERVER['HTTP_X_REAL_IP'])) { 
            $cur_ip = $_SERVER['HTTP_X_REAL_IP']; 
        } else { 
            $cur_ip = $_SERVER['REMOTE_ADDR']; 
        } 
        if (in_array($cur_ip, ['168.119.157.136', '168.119.60.227', '138.201.88.124', '178.154.197.79'])) { 
            $valid_ip = true; 
        } 
        if (!$valid_ip) { 
            echo 'hacking attempt! | ip error | cur_ip='.$cur_ip; 
            return false; 
        } 
 
        /** 
         * Сравнение сигнатур 
         */ 
		function check(){ 
		$Sign = $reply['SIGN']; 
		$ch_sign = md5($reply['MERCHANT_ID'].':'.$reply['AMOUNT'].':'.$cfg['payments'][ID_FK - 1]['key2'].':'.$reply['MERCHANT_ORDER_ID']); 
 
		 
        if ((string)$ch_sign !== (string)$_REQUEST['SIGN']) { 
            echo 'Bad signature: '.$sign; 
            return false; 
        } 
        echo 'YES'; 
        return true; 
		$db = new PDO('mysql:host='.$cfg['db']['host'].';dbname='.$cfg['db']['name'], $cfg['db']['user'], $cfg['db']['pass']); 
			$db->query("SET NAMES '".$cfg['db']['charset']."'"); 
			 
			if ( $db->query("SELECT COUNT(0) FROM `".$cfg['db']['trans']."` WHERE `status` = 'success' AND `payid` = ". $params['fk_o'])->fetchColumn() ) 
			{ 
				die('столбец не выбран!'); 
			} 
			 
				if ( !$db->query("INSERT INTO `".$cfg['db']['trans']."` VALUES (NULL, ". $params['fk_o'] .", ". $params['fk_us_shpuserid'] .", ". round($params['sum']) .", 'success', '". $params['fk_currency'] ."', ". time() .")") ) 
				{ 
				$db->query("UPDATE `{$cfg['db']['users']}` SET `{$cfg['db']['money']}` = {$cfg['db']['money']} + ".round($params['sum'])." WHERE `{$cfg['db']['userid']}` = {$params['fk_us_shpuserid']}"); 
 
        /** 
         * Сравнение суммы оплаты и суммы заказа 
         */ 
        if ((float) $reply['AMOUNT'] !== (float) $params['fk_oa']) { 
            $params['fk_o']->update_status('failed', __('Платеж не оплачен')); 
 
            throw new \Exception('Суммы заказа не совпадают. ' . ' Amount FreeKassa -> ' . $reply['AMOUNT'] . ' Amount shop -> ' . (float) $params['fk_oa']); 
        } 
 
 
        if ($_REQUEST['freekassa'] === 'result') { 
 
 
        if ($_REQUEST['freekassa'] === 'success') { 
				 
 
 
		 
	} 
        if ($_REQUEST['freekassa'] === 'fail') { 
			die('оплата не прошла'); 
        } 
    } 
 
				} 
 
			} 
	} 
}	 
}