Hi,

"Mark as Scanned" button appears only when the order status is set to "Completed".

You can set your orders automatically as "completed" via a hook I wrote for you.

Open your theme or child-theme functions.php file and somewhere at the bottom insert:

/**
 * Stachethemes Event Calendar Mod
 * 
 * Executes after a WooCommerce order is placed.
 *
 * This function checks if the order contains any tickets. If it does, and the order's status is 'processing',
 * it will update the order's status to 'completed'.
 *
 * @param int $order_id The ID of the WooCommerce order.
 */
add_action('woocommerce_thankyou', function($order_id) {
    if (!class_exists('Stachethemes\Stec\Stachethemes_Event_Calendar')) {
        return;
    }
    if (!$order_id) {
        return;
    }
    $order             = wc_get_order($order_id);
    $order_has_tickets = \Stachethemes\Stec\Booking::order_has_tickets($order);
    if (true === $order_has_tickets) {
        if ($order->get_status() === 'processing') {
            $order->update_status('completed');
        }
    }
    
}, 10);