“woocommerce_order_status_” used to define a callback for any order status changed. It works once we changed the order status

So here we need to specify the action.

Usually used once we declare a new order status.

Sample code is for “invoice” action

add_action(‘woocommerce_order_status_invoice, ‘custom_order_action’ );

 

function custom_order_action($order_statuses)

{

/* code execute after status changed */

 

}