How to add custom checkout field in user details mail template
Use woocommerce_email_customer_details. function email_order_user_meta( $order, $sent_to_admin, $plain_text ) { $meta = get_post_meta($order->ID, ‘OIB’); if($meta){ /*** whatever format you like here ***/ echo ‘<tr>’ . $meta ‘</tr>’; } } add_action(‘woocommerce_email_customer_details’, ’email_order_user_meta’, 30, 3 );