E-mail confirmation error

[kubo12312]

Hello,

I have problem with {total_tax_paid} in confirmation mail. I added this line into PaymentModule.php

'{total_tax_paid}' => Tools::displayPrice(($order->total_products_wt - $order->total_products) + ($order->total_shipping_tax_incl - $order->total_shipping_tax_excl), $this->context->currency, false));

Into order_conf.txt I added Total tax paid: {total_tax_paid} and html code into order_conf.html and I still have a error in email.

Can you help me?