$ch = curl_init("https://plesklink:8443/api/v2/auth/keys");
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST => true,
    CURLOPT_USERPWD => "admin:pass",
    CURLOPT_HTTPHEADER => [
        "Content-Type: application/json"
    ],
    CURLOPT_POSTFIELDS => "{}",
    CURLOPT_SSL_VERIFYPEER => false,
]);
$response = curl_exec($ch);
curl_close($ch);
echo $response;