How to change the price of products in the cart?

Question

WooCommerce

I am making a bonus system for the store. I need to change the price of the goods in the basket on the checkout page, tell me how can I do it?

After I enter the number of bonuses to be written off, I send ajax when the cart is successfully updated.

Answer 1

This is how the cart discount is done

add_filter( 'woocommerce_cart_calculate_fees', 'add_my_fee', 10, 1 );

function add_my_fee( $cart ) {
     $cart->add_fee( 'Моя мега скидка 100 рублей', -100 );
}