API Validation using the SlideShare API All requests made using the SlideShare API must have the following parameters: api_key: Set this to the API Key that SlideShare has provided for you. ts: Set this to the current time in Unix TimeStamp format, to the nearest second(?). hash: Set this to the SHA1 hash of the concatenation of the shared secret and the timestamp (ts). i.e. SHA1 (sharedsecret + t