X-Yahoo-HJAuth-Token
This is the session token returned by the Authentication API call
X-Yahoo-HJAuth-Timestamp
This must be the request timestamp in Unix Timestamp format: the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC.
X-Yahoo-HJAuth-Signature
The signature is a MD5 hash of the XML request, request timestamp, job id (empty for a new job), token and license key, in that order, encoded in hexadecimal format.