How to display sales channel on packing slips?

[DWsocial]

Hi, 

So there must be a variable that isn't discussed on the forum of shopify and no other information is on the internet. I want to display for the warehouse employees on the packing slip the source of the sales channel. So when people buy from the website we can see ''Online Store'' on the order list online and when people buy from other channels such as an mobile app you see nothing. It really doesn't matter that you don't see anything when purchased from a different source. I want to display the ''online store'' text on the packing slip if order is placed on the website. There only is not mentioned a liquid variable for the source channel. On the (order url).json I have found that te variable is changing of ''source_name'':''web'' to ''source_name'':''265532'' when the purchase is made from the app. So I thought I would just paste this on the packing slip {{ order.source_name }} but this doesn't seem to work. I really need this to work for it would cost us really long hours to check each order if it is an app or not and for sorting the packing slips.