400 Bad Request
This could happen if the service name or method name is misspelled, or the wrong number or names of parameters have been supplied.
403 Forbidden
This means that you do not have permission to perform the request. It usually means that the IP address you are making the request from has not been added to your license. Contact your account manager to have additional IPs authorized for your license.
500 Internal Server Error
This is rare, indicating a server outage. It could occur during server maintenance.