An internal function to authenticate requests, deprecated as of v0.5.
authenticate(operation, secret,
service = "AWSMechanicalTurkRequester", version = "2012-03-25")A character string containing the operation to be performed.
The AWS Secret Access Key used to encode the authentication signature.
The MTurk service to which the authenticated request will be sent. Supplied only for advanced users.
The version of the MTurk API that will be used. Default is the most current version.
A list containing the operation to be performed, a base64 encoded, HMAC signature character string, and a formatted timestamp.
This is a former function that authenticated MTurk API requests. It is now deprecated because request now calculates the authentication signature internally and has added service and version arguments.