WordPress

<script src="https://your-domain.com/api/track.js?site=YOUR_TRACKING_CODE"></script>

<script src="https://your-domain.com/api/track.js?site=YOUR_TRACKING_CODE"></script>

<button onclick="postMetric('track', 'goal', { event: 'button_click' })">
  Click me
</button>

document.getElementById("my-button").addEventListener("click", function () {
  postMetric("track", "goal", { event: "button_click" });
});

add_action('woocommerce_thankyou', 'track_purchase');
function track_purchase($order_id) {
    $order = wc_get_order($order_id);
    ?>
    <script>
    postMetric('track', 'goal', {
        event: 'purchase',
        value: <?php echo $order->get_total(); ?>
    });
    </script>
    <?php
}