I have some clients that would like to print labels from the Carrier ATS Healthcare directly from ShipStation. There is an API available that ShipStation could use. https://atsapi-dev.azurewebsites.net/swagger/index.html
Thank you for your post in the community! The good news is that ATX Healthcare can sign up to become a partner with ShipStation. Here’s the linkfor them to submit an inquiry for partnership approval.