my code
function etheme_child_product_shipping_banner() {
global $product;
$shipping_class = $product->get_shipping_class();
switch ( $shipping_class ) {
case 'duze-inpost':
echo 'Kurier';
break;
case 'drobnica':
echo 'paczkomat';
break;
}
}
add_action('woocommerce_before_single_product', 'etheme_child_product_shipping_banner', 20 );