Tax error in order confirmation email with discounts 1.5.6.2

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I have noticed that there is an error in the taxes amount for orders with discounts at the confirmation email send to customers. 

 

In payment_module.php the amount of taxes to be displayed in the order_conf.html is calculated like

 

{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))

 

being total_products_wt and total_products the amount before any discount. 

 

I have changed it to:

 

{total_tax_paid}' => Tools::displayPrice(($order->total_paid_tax_incl - $order->total_paid_tax_excl), $this->context->currency, false)

 

and seems to work fine.