I wish you could provide integration with www.parcel2go.com.
They are really good service and i hope you could help me with this as i use it very often byt the only way i can send parcel using them is by exporting the CSV file from shipstation. I am sure this will generate new sales for you as many people uses parcel2go every day.
parcel2go is unique as they offer all services to any people so you do not need to register with new individual carrier, only with parcel2go and all job is done by them. All we need is to be able to communicate with their API to send parcel and address details to my account.