<?php
use WHMCS\User\Client;

add_hook('TicketOpen', '1', function($vars) {
                                     $clientid=$vars['userid'];
    $client = new Client($vars['userid']); // Retrieve client data for client id `userid`.

    $email = $client->email; //The clients email will be stored in the $email var

   
   
    $url2 = "https://clients.hostsailor.com/includes/api.php"; # URL to WHMCS API file
   
    $postfields["username"] ="given our username";
    $postfields["password"] = "given our password";
    $postfields["clientid"] = $clientid;
     
    $postfields["action"] = "getclientsdetails";
    $postfields["responsetype"] = "xml";
   
    $query_string = "";
    foreach ($postfields AS $k=>$v) $query_string .= "$k=".urlencode($v)."&";
   
    $chh = curl_init();
    curl_setopt($chh, CURLOPT_URL, $url2);
    curl_setopt($chh, CURLOPT_POST, 1);
    //curl_setopt($chh, CURLOPT_TIMEOUT, 30);
    curl_setopt($chh, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($chh, CURLOPT_POSTFIELDS, $query_string);
    curl_setopt($chh, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($chh, CURLOPT_SSL_VERIFYPEER, 0);
    $xmldata = curl_exec($chh);

    if (curl_error($chh))
    {
        die("Connection Error: ".curl_errno($chh).' - '.curl_error($chh));
    }
    else
    {   
   
        $data = new SimpleXMLElement($xmldata);
        foreach($data->client as $itm)
        {
            $firstname=$itm->firstname;
            $lastname=$itm->lastname;
        }
    }
   
        $data = [
    'email'     => $email,
    'status'    => 'subscribed',
    'firstname' => $firstname,
    'lastname'  => $lastname
];

syncMailchimp($data);

function syncMailchimp($data) {
    $apiKey = 'api-key';
    $listId = 'list-id';

    $memberId = md5(strtolower($data['email']));
    $dataCenter = substr($apiKey,strpos($apiKey,'-')+1);
    $url = 'https://' . $dataCenter . '.api.mailchimp.com/3.0/lists/' .
$listId . '/members/' . $memberId;

    $json = json_encode([
        'email_address' => $data['email'],
        'status'        => $data['status'],
        'merge_fields'  => [
            'FNAME'     => $data['firstname'],
            'LNAME'     => $data['lastname']
        ]
    ]);

    $ch = curl_init($url);

    curl_setopt($ch, CURLOPT_USERPWD, 'user:' . $apiKey);
    curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type:
application/json']);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $json);

    $result = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    return $httpCode;
}

   
});

?>