add_filter('woocommerce_product_get_price', 'adjust_price_by_user_location', 10, 2);
function adjust_price_by_user_location($price, $product) {
    $user_country = WC()->customer->get_billing_country();

    if ($user_country == 'US') {
        $price = $price * 1.1; // 10% Aufschlag für US-Kunden
    }

    return $price;
}