How to add more info in Orders informations page

Hi,

It's not possible for a plugin to add its information to the additional area.
However, it is possible to create new areas with its information.
To do that, you can implement the trigger onAfterOrderProductsListingDisplay(&$order, $viewName) in your plugin.
$order will contain the data of the current order and $viewName will contain the name of the view which in this case will be "order_back_show".
You can directly echo HTML in that function and it will be displayed between the products listing and the history listing on this page.

Hi,

Sure. First you could create your own table and store your data there along with the order_id so that you could then read it later it using the order_id for reference.
Otherwise, you could also store your data in the order_payment_params column of hikashop_order like that:

$params = $order->order_payment_params;
$params->my_data = new stdClass();
$params->my_data->blabla = 'text text';
$orderObject = new stdClass();
$orderObject->order_id = $order->order_id;
$orderObject->order_payment_params = $params;
$class = hikashop_get('class.order');
$class->save($orderObject);