Klaviyo Track API

migration.php

<?php

$data = [
    'token' => 'KXZ6gp',
    'event' => 'Elected President',
    'customer_properties' => [
        '$email' => 'thomas.jefferson@example.com'
    ],
    'properties' => [
        'PreviouslyVicePresident' => true,
        'YearElected' => 1801,
        'VicePresidents' => ['Aaron Burr', 'George Clinton'],
    ],
    'time' => 1546034508,
];

echo urlencode(base64_encode(json_encode($data)));