Woocommerce简单拍卖：最终价格提高10％

I want to achieve this: when auction is ended, user click "Pay Now", product is added in user's cart but final price (eg. $50) is increased by 10% Goal is to increase final auction price by 10%, winner should pay 10% more.

I tried to increase with "WooCommerce Dynamic Pricing & Discounts by RightPress" by targeting products with "_auction_start_price" meta data - no luck. Also I tried with this code:

function before_calculate_totals( $cart  ) {
 if ( is_admin() && ! defined( 'DOING_AJAX' ) ) {
 return;
 }
 // Iterate through each cart item
 foreach ( $cart->get_cart() as $cart_item ) {
        $product_id = $cart_item['product_id'];
        $product_price = $cart_item['data']->get_price(); // get the price
        $meta = get_post_meta($product_id, '_auction_start_price', true);
        if ($meta > 0) {
             $new_price = $product_price+($product_price*0.1); // add 10% to price
        } else {
             $new_price = $product_price+100; 
        }



        $cart_item['data']->set_price(floatval($new_price)); // set new price
    }
}
add_action( 'woocommerce_before_calculate_totals', 'before_calculate_totals', 10, 1 );

This code works with normal simple products, but not with auction items.

I have Woocommerce 3.0+