What authentication method am I using? :-) : I am connecting to Microsoft IIS server from php-script using curl to send some json data, everything is working fine. But i have theoretical question - what type of authentification am I using? :-)

Code sample is below:

$curlheader = array("Content-type: application/json", "Auth: N@0062Ibb$#=="); //"Auth:" is changed

$url = "http://xxx.xxx.xxx.xxx:81/feed/ProdICCFeeds/"; //ip is also changed

curl_setopt($curl, CURLOPT_URL, $url); //set url

curl_setopt($curl, CURLOPT_HEADER, false); 

curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

curl_setopt($curl, CURLOPT_POST, true); //http POST

curl_setopt($curl, CURLOPT_HTTPHEADER, $curlheader); //set header

$content = json_encode($aParamsArray); //set paameters, not here

curl_setopt($curl, CURLOPT_POSTFIELDS, $content); 

$json_response = curl_exec($curl);

$status = curl_getinfo($curl, CURLINFO_HTTP_CODE);