woocommerce change price in checkout and cart page

Question

With woocommerce, in my website I\'d like to add in the cart page a select input where the user can select a value between two options, and depending on this value I will ch

Answer 1

Payment gateway always uses $order->get_total() variable to fetch cart grand total. So in order to tweak use this filter woocommerce_order_amount_total for your function if you do follow below steps. Your payment gateway always shows the total you tweaked.

add_filter( 'woocommerce_order_amount_total', 'custom_cart_total' );
function custom_cart_total($order_total) {
  return $order_total *= 0.25;
}

Answer 2

You can use woocommerce_review_order_before_order_total hook too at the same time, to display your custom price in checkout, this way:

add_action( 'woocommerce_review_order_before_order_total', 'custom_cart_total' );
add_action( 'woocommerce_before_cart_totals', 'custom_cart_total' );
function custom_cart_total() {

    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
            return;

    WC()->cart->total *= 0.25;
    //var_dump( WC()->cart->total);
}

The Code goes in function.php file of your active child theme (or theme) or also in any plugin file.

This code is tested and works.