How to replace the promotional price of a product with a regular one in Woocommerce when choosing a specific payment method?

Question

WordPress

As you know, in woocommerce out of the box, a product has 2 prices - a base price and a sale price.
woocommerce has several payment methods. One of these methods is the installment sale. According to the terms of use of the payment gateway that provides installments, it is impossible to impose additional taxes and duties on goods, i.e. the value of the goods must not exceed the base price. At the same time, the conditions for working with the gateway allow the cancellation of promotional prices, coupons and bonuses.
The crux of the matter is as follows. How to make it so that when choosing a certain payment method, the promotional price of the goods is replaced by the base one?
Been searching for weeks now and can't find a solution.