Hello Mr. Chadwick,
Thanks for sharing your requirement here.
I have seen your app: apps.shopify.com/wc-fulfillment visited & analyzed it.
Experts are here at 99coders to help you - I am ready to help you in another app - I am also Shopify partner, you can check my apps, recently I have launched two apps-
Please share me the details to start work & finish quickly -
Waiting for you on skype - email@example.com
Email is - firstname.lastname@example.org
Waiting for your reply