嗅探POST方法这个代码安全吗？

Question

大家好，我刚刚为我的网站写了一个php代码作为网关 我想知道黑客是否嗅到网页并找到我的MerchantId或者没有？

 <?php

$MerchantID = 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX'; //Required
$Amount = 1000; //Amount will be based on Toman - Required
$Description = 'some describtion'; // Required
$Email = 'UserEmail@Mail.Com'; // Optional
$Mobile = '09123456789'; // Optional
$CallbackURL = 'http://www.yoursoteaddress.ir/verify.php'; // Required


$client = new SoapClient('https://www.zarinpal.com/pg/services/WebGate/wsdl', ['encoding' => 'UTF-8']);

$result = $client->PaymentRequest(
[
'MerchantID' => $MerchantID,
'Amount' => $Amount,
'Description' => $Description,
'Email' => $Email,
'Mobile' => $Mobile,
'CallbackURL' => $CallbackURL,
]
);
?>