I use Shopify for my own business. I found picking orders a bit of a pain so I developed a mobile app. What happens is the following:
1. I can print a label for my shipment provider (I used DPD)
2.When I scan the barcode using the Mobile App I developed on the shipment label, it picks up the Order Number (or I can enter it manually)and automatically pulls up the Order on my phone.It works really well, and it saves me lots of time. It even displays notes and in my case the I allow for personalisation and it displays this.I'm currently using a private API, but I'm thinking of making this a Shopify App.
Would anyone find this useful ??