How to process the total cost of a WooCommerce order?

Question

WordPress

It is necessary that after clicking on the "place an order button" the amount that turned out went through my formula.
Maybe someone did it.
If possible, a short example.

Answer 1

I made three prices for the client (retail, wholesale, opt2) from the amount in the basket.
All actions for outputting and processing data are in these files:

\themes\name\woocommerce\cart\cart.php
\themes\name\woocommerce\checkout\review-order.php
\themes\name\woocommerce\emails\email-order-items.php
\themes\name\woocommerce\order\order-details.php
\themes\name\woocommerce\order\order-details-item.php