How to make a request and get the response xml SDEK api?

Question

PHP

Hello. I use SDEK API 1.5 (due to an extremely old site on an old version of php). You need to create an order through the API, I do this:

<?php
$soap = curl_init('https://integration.cdek.ru/new_orders.php');
curl_setopt($soap, CURLOPT_POST, 1);
curl_setopt($soap, CURLOPT_RETURNTRANSFER, 1);

date_default_timezone_set('UTC');
$date = date('c');
$secure = md5($date.'&JUSHGFnlu.............yv4HDFfdh2');

$request = <<<XML
<?xml version="1.0" encoding="UTF-8" ?> 
<DeliveryRequest Number="236" Date="2020-08-07T16:54:10" Account="hjyT9687bjkhg78GiutTOGLbhjGO87DD" Secure="<?=$secure?>" 
OrderCount="1">
<Order Number="1010203040"  
DeliveryRecipientCost="0"   
SendCityCode="270"      
RecCityCode="44"    
RecipientName="Тест"    
Phone="7810999, 9295849151"     
Comment="Тест"  TariffTypeCode="5"  RecientCurrency="RUB"   
ItemsCurrency="RUB">    
<Address PvzCode="MSK2" />  
<Package Number="1" BarCode="101" Weight="630">        
<Item 
WareKey="25000050368" 
Cost="49" 
Payment="49" 
Weight="68" 
Amount="1" 
Comment="Тест"/>       
<Item WareKey="25000348563" 
Cost="79" 
Payment="79"
Weight="95" 
Amount="1" 
Comment="вы"/>      
</Package>  
<AddService ServiceCode="30"></AddService>   
</Order> 
</DeliveryRequest>
XML;

curl_setopt($soap, CURLOPT_POSTFIELDS, [
    'xml_request' => $request
]);

$headers = array();
$headers[] = 'Content-Type: application/x-www-form-urlencoded';
curl_setopt($soap, CURLOPT_HTTPHEADER, $headers);


$result = curl_exec($soap);
if (curl_errno($soap)) {
    echo 'Error:' . curl_error($soap);
}
curl_close ($soap);

echo "<pre>";
print_r($result);
echo "</pre>";
?>

But in response to some fig, no error is returned, nothing like that, namely, an incomprehensible 16-digit character set and EVERYTHING !! For example 052a064064052211

What could be the problem?