Woocomerce what happens during checkout?

Question

JavaScript

You need to change the shipping cost directly in the shopping cart at checkout.
we initially have a shipping cost of 500 rubles, using the js (ymaps api) method we find out the shipping costs and get 1000 rubles.
how can I either change the shipping cost, or intercept (I can’t find the file in which the delivery form is being processed) the data sent for processing and change it there. so that in the formed order for delivery there was a cost of 1000 rubles.
Thank you

Answer 1

add_action('woocommerce_new_order', "your_function");

Hook to create an order, then you can do this

function your_function($order_id){
$order = new WC_Order($order_id);
$order->set_total("1000","shipping");
}

It should work, more specifically for your needs, add