Modify order id to order number

add_filter('pr_shipping_dhl_label_args', 'modify_order_id_to_number', 10, 2);
function modify_order_id_to_number($args, $order_id) {
 	$order = wc_get_order( $order_id );
	$args['dhl_settings']['dhl_label_ref'] = $order->get_order_number();
	return $args;
}

Thanks a lot for that code! I use Woocoommerce and DHL Paket plugin on Wordpress. My goal is to put some product information on my DHL label. Could be at Shipper Contact, Customer Contact or Reference ID field. I tried to access the variables on the label via add_filter('pr_shipping_dhl_label_args'...) like you show in your code examples. But i am not able to access any of the arguments. Nothing changes on the label. Do you have an idea what the problem is? For example i tried this:

add_filter('pr_shipping_dhl_label_args', 'modify_order_id_to_number', 10, 2); function modify_order_id_to_number($args, $order_id) { $args['dhl_settings']['dhl_label_ref'] = "dummy text"; // or this: $args['shipping_address']['phone'] = "dummy text"; return $args; }

Nothing happens on the label. Do you have an idea what might be wrong? Thank you very much!