I spoke with support and they keep referring me here to try to attract some attention to this issue. The carrier I use, Argo Shipping, is not currently a ShipStation partner, but they want to be. This came up because we want to see the rates the provide us show directly onto ShipStation, but because Argo is not yet a SS partner and are instead directly integrated into our SS, we can't see the rates yet.
Argo has told me they have all of the API's and technology built to provide to ShipStation at a moment's notice, but that they have not ever received a response when submitting to become a partner.
Can someone please help me with this? I'd really like to be able to see exactly what I'm paying in ShipStation itself through my carrier, Argo. I'm happy to connect you with the Argo team as well. Please help!