This is what you get if you try this from Canada:

{"__PHP_Incomplete_Class_Name":"EasyPost\\Error","httpStatus":400,"httpBody":"{\"error\":\"Invalid State Code. \"}","jsonBody":{"error":"Invalid State Code. "},"param":"I"}

Free to answer any questions about the project, making the shirts, getting it automated with making the shirts, process, anything. Lose to hear feedback!