We're new to ShipStation and are shipping from Canada to USA packages that require customs clearance. At the moment, we're able to choose which agency (between UPS SCS & a private broker) using UPS Connect. We would like to have this option to use in ShipStation or at least the option to choose UPS SCS. Right now, we haven't even found which broker is even used in ShipStation. Any advice on clearing customs and shipping from Canada to the USA using ShipStation would be so appreciated.