protected function storeOldTimestamp($key)
    {
        return $this->config('forbid_old_passwords') === true
            ? $this->sessionPut(Constants::SESSION_OTP_TIMESTAMP, $key)
            : $key;
    }
protected function storeOldTimestamp($key)
    {
        return $this->config('forbid_old_passwords') === true
            ? $this->sessionPut(Constants::SESSION_OTP_TIMESTAMP, $key)
            : $key;
    }
protected function storeOldTimestamp ( $ key ) { return $ this -> config ( 'forbid_old_passwords' ) === true ? $ this -> sessionPut ( Constants :: SESSION_OTP_TIMESTAMP , $ key ) : $ key ; }
Store the old OTP timestamp.

@param $key

@return mixed
Store the old OTP timestamp .