Communication
Requests will be sent over the REST protocol.

Security
Requests will be sent over HTTPS only. Each request is also sent using a custom Basic Authorization Realm. There are some sensitive parameters in the requests that are expected to be signed.

HTTP Response Code
Please refer to the standard HTTP response codes. Where anything starting with 2XX signifies approved, 4XX means client error and 5XX indicates server error. When the response codes start with 4XX or 5XX, an error object will be returned to explain further the reason for this failure. See Appendix A for error code descriptions.