I have a fully functional integration with ShipStation where my company's employees use our internal system to assemble, package and ship different kind of gift boxes.
At the moment, the system is totally integrated to the ShipStation platform, meaning that the uses of our internal system have no need to access ShipStation. Everything is done through the API.
Unfortunately, when there are customs forms to be printed, it is impossible to fetch them through the API, so they need to access the ShipStation website just to get those. Would be really nice to have an API call through which I could fetch the customs forms and print them through my system.