Meta Pixel – InitiateCheckout Event

/**

 * =============================================================================

 * META PIXEL — InitiateCheckout (WooCommerce Checkout)

 * =============================================================================

 * Fires on checkout page (not thank you).

 * Includes contents + value.

 * Adds a sessionStorage guard to reduce accidental duplicates.

 */

add_action('wp_footer', 'voelgoed_meta_pixel_initiate_checkout', 20);

function voelgoed_meta_pixel_initiate_checkout() {

    if (is_admin() || wp_doing_ajax()) return;

    if (!function_exists('is_checkout') || !is_checkout()) return;

    if (function_exists('is_order_received_page') && is_order_received_page()) return;

    if (!function_exists('WC') || !WC()->cart || WC()->cart->is_empty()) return;

    $cart = WC()->cart;

    $content_ids = [];

    $contents    = [];

    foreach ($cart->get_cart() as $cart_item) {

        $product_id   = !empty($cart_item['product_id']) ? (int) $cart_item['product_id'] : 0;

        $variation_id = !empty($cart_item['variation_id']) ? (int) $cart_item['variation_id'] : 0;

        $id = $variation_id ? $variation_id : $product_id;

        $qty = !empty($cart_item['quantity']) ? (int) $cart_item['quantity'] : 0;

        $product = !empty($cart_item['data']) ? $cart_item['data'] : null;

        $unit_price = 0.0;

        if ($product && is_object($product) && method_exists($product, 'get_price')) {

            $unit_price = (float) $product->get_price();

        }

        if ($id > 0 && $qty > 0) {

            $content_ids[] = (string) $id;

            $contents[] = [

                'id'         => (string) $id,

                'quantity'   => $qty,

                'item_price' => round((float) $unit_price, 2),

            ];

        }

    }

    $content_ids = array_values(array_unique($content_ids));

    $value     = (float) $cart->get_total('edit');

    $currency  = function_exists('get_woocommerce_currency') ? get_woocommerce_currency() : 'ZAR';

    $num_items = (int) $cart->get_cart_contents_count();

    ?>

    <script>

    (function () {

        if (typeof fbq !== 'function') return;

        // Prevent accidental double fires (reloads / fragments / theme quirks)

        var key = 'vg_fb_initiatecheckout_fired';

        try {

            if (sessionStorage.getItem(key) === '1') return;

            sessionStorage.setItem(key, '1');

        } catch (e) {}

        fbq('track', 'InitiateCheckout', {

            content_ids: <?php echo wp_json_encode($content_ids); ?>,

            content_type: 'product',

            contents: <?php echo wp_json_encode($contents); ?>,

            value: <?php echo wp_json_encode($value); ?>,

            currency: <?php echo wp_json_encode($currency); ?>,

            num_items: <?php echo (int) $num_items; ?>

        });

    })();

    </script>

    <?php

}