Insira valores em uma tabela personalizada assim que o pedido for feito no Woocommerce

<?php

#-------------------- code begins below -------------------------#

add_action( 'woocommerce_order_status_completed', 'my_function' );
function my_function($order_id) {
    global $wpdb;

    // Getting the order (object type)
    $order = wc_get_order( $order_id );

    // Getting order items
    $items = $order->get_items(); 
    $total_items_qty = 0;

    // Iterating through each item (here we do it on first only)
    foreach ( $items as $item ) {
        $total_items_qty += $item["qty"];
    }

    // Here are the correct way to get some values:
    $customer_id           = $order->customer_user;
    $billing_email         = $order->billing_email;
    $complete_billing_name = $order->billing_first_name . ' ' . $order->billing_last_name;

    // Getting the user data (if needed)
    $user_data             = get_userdata( $customer_id );
    $customer_login_name   = $user_data->user_login;
    $customer_login_email  = $user_data->user_email;

    // "$wpdb->prefix" will prepend your table prefix
    $table_name =  $wpdb->prefix."license_table";

    // This array is not correct (as explained above)
    $data = array( 
        'username'          => $customer_login_name,
        'order_id'          => $order_id,
        'number_of_cameras' => $total_items_qty,
        'boolean'           => 'false',
    );

    $wpdb->insert( $table_name, $data );

}

#-------------------- code end -------------------------#

?>