woocommerce change price in checkout and cart page - php

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 change the price.
so far, I could get the total and change it using this :
function action_woocommerce_before_cart_totals( ) {
global $woocommerce;
$woocommerce->cart->total = $woocommerce->cart->total*0.25;
var_dump( $woocommerce->cart->total);};
The issue is that when I go to checkout page it doesn't take the total calculated in functions.php
Thanks for helping me.

Answer 1

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.

Answer 2

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;
}