send.php

 $data = array (
        'email' => (isset($_GET['email']) ? $_GET['email'] : ''),
        'voornaam' => (isset($_GET['firstname']) ? $_GET['firstname'] : ''),
        'achternaam' => (isset($_GET['lastname']) ? $_GET['lastname'] : ''),
        'geslacht' => (isset($_GET['gender']) ? $_GET['gender'] : ''), // m v
        'geboortedatum' => (isset($_GET['dob']) ? $_GET['dob'] : ''), // dd-mm-yy
        'actieid' => '4',
        'campaign' => 'basebuilders',
        'campaign_medium' => $campaign_medium,
        'specification' => $specificatie,
        'source' => 'basebuilders',
        'fee' => $fee,
        'content' => $specificatie,
        'medium' => 'cpl',
        'link' => $link,
    );


    $Engine->subscribeNewsLetter($data,'subscribe');