Customize WooCommerce Order Emails

woocommerce_email_after_order_table woocommerce_email_before_order_table
add_action( 'woocommerce_email_after_order_table', 'wdm_add_shipping_method_to_order_email', 10, 2 );
function wdm_add_shipping_method_to_order_email( $order, $is_admin_email ) {
    echo '<p><h4>Shipping:</h4> ' . $order->get_shipping_method() . '</p>';
}