I have added shipping cost for the orders that are synced from Amazon. For some reason I had to set custom shipping flat price in woo-orders created for Amazon-order. It is done as follow:
$OrderOBJ = wc_get_order(2343);
$item = new WC_Order_Item_Shipping();
$new_ship_price = 10;
$shippingItem = $OrderOBJ->get_items('shipping');
$item->set_method_title( "Amazon shipping rate" );
$item->set_method_id( "amazon_flat_rate:17" );
$item->set_total( $new_ship_price );
$OrderOBJ->update_item( $item );
$OrderOBJ->calculate_totals();
$OrderOBJ->save()
The problem is, I have to update orders in each time the status is changed in Amazon, there is no problem doing that, problem is I have to update the shipping cost also if it is updated. But I have not found anyway to do so. Can anyone tell me how to update the shipping items of orders set in this way? Or is it the fact that, once shipping item is set then we cannot update or delete it?