Hi @mumerhasan!
I apologize for the confusion, that API has been deprecated, we now have our documentation at https://developer.shiphero.com/
To be able to get order information you could use the Order query, we have a few examples of queries you could use here
For a sandbox account, you could reach us at support@shiphero.com and request it from our team
Let me know if I could explain better or there is anything else I could help with.
Thanks again!
Tom