This would be an awesome connector for many folks I think, especially me! 
ShipStation auto generates API keys in the account settings.
Shipstation API Documentation:
https://www.shipstation.com/developer-api/#/reference
There's alot you can do with this one so it would be a nice list of options for users. I would try it myself but my xml skills are not good at all tbh.
Maybe we can start small with a quick feature like "Export Orders" that would pull all open orders. And then possible another option to "Import Orders" - Maybe any order that already exists while importing can take on those new changes.