<?php
$url = "https://admin.bonus.vtb24.ru:543/NotifyOrderStatus";

$cert_file = '/home/bitrix/ext_www/conditions.e-tiketka.com/api/cert/client.crt';
$key_file = '/home/bitrix/ext_www/conditions.e-tiketka.com/api/cert/client.key';

//$cert_password = 'nosecure';
$data_string = '<?xml version="1.0" encoding="utf-8"?>
<NotifyOrderStatusMessage xmlns="http://tempuri.org/XMLSchema.xsd">
<Orders>
<Order>
<InternalOrderId>84</InternalOrderId>
<StatusCode>30</StatusCode>
<StatusDateTime>2019-01-01T12:30:00.0</StatusDateTime>
</Order>
</Orders>
</NotifyOrderStatusMessage>';

header("Content-type: text/xml; charset=utf-8");
//echo $data_string;
//die();

$ch = curl_init();

$options = array(
    CURLOPT_RETURNTRANSFER => true,
    //CURLOPT_HEADER => true,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_SSL_VERIFYHOST => false,
    CURLOPT_SSL_VERIFYPEER => false,
    CURLOPT_USERAGENT => 'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)',
    CURLOPT_VERBOSE => true,
    CURLOPT_URL => $url ,
    CURLOPT_POST => 1,
    CURLOPT_CUSTOMREQUEST => 'POST',
    CURLOPT_POSTFIELDS => $data_string,
    CURLOPT_HTTPHEADER => array('Content-type: application/xml', 'Content-length: '. strlen($data_string)),
    CURLOPT_HEADER => true,
    CURLOPT_SSLCERT => $cert_file ,
    //CURLOPT_SSLCERTPASSWD => $cert_password ,
    CURLOPT_SSLKEY => $key_file
);

curl_setopt_array($ch, $options);

$output = curl_exec($ch);

if (!$output) {
    echo "Curl Error : " . curl_error($ch);
} else {
    echo htmlentities($output);
}