Override price based on group/role of logged in user

gistfile1.php

    add_filter('woocommerce_get_sale_price', 'my_custom_price', 99, 2);
    add_filter('woocommerce_get_price', 'my_custom_price', 99, 2);
    
    function my_custom_price( $price, $product )
    {
        //your logic for calculating the new price here

        //Half price for VIP-customers
        if( in_array('vip', get_userdata(get_current_user_id())->roles )
        {
            $price = $product->get_regular_price() / 2;
        }

        //Return the new price (this is the price that will be used everywhere in the store)
        return $price;
    }