Problem: GSO is not an available carrier for Mark as Shipped User Goal:
Add GSO as a carrier for Mark as Shipped, and specify
'https://www.gso.com/Trackshipment?TrackingNumbers={trackingnumber}' as
the tracking link, so that when we notify Shopify of...
.png%20copy%20(6).png "Occasional Author"){kind=icon}
.png%20copy%20(3).png "First time author"){kind=icon}
