      and it should NOT contain the API key as it is added here.
      
      - parameters:
-        - request The outbound NSMutableURLRequest.
+        - request: The outbound NSMutableURLRequest.
      */
     func encodeRequest(request: NSMutableURLRequest) {
         let timestamp = getCurrentTimeStamp()

     Generates an authentication code using HMAC-SHA256.
     
     - parameters:
        - request The outbound NSMutableURLRequest used to generate the signature.
        - timestamp The timestamp used to generate the signature.
     
     - returns: The encoded signature.
     */

     Adds a signature to the authorization header of the outbound request.
     
     - parameters:
        - request: The outbound NSMutableURLRequest.
        - timestamp: The timestamp used to generate the signature.
     */
    func addSignature(request: NSMutableURLRequest, timestamp: String) {
        if let signature = generateSignature(request, timestamp: timestamp) {
