code: public function validate($token)
      {
          $params = [
              $token,
              $this->request->get('timestamp'),
              $this->request->get('nonce'),
          ];
  
          if (!$this->debug && $this->request->get('signature') !== $this->signature($params)) {
              throw new FaultException('Invalid request signature.', 400);
          }
      }
docs: Validation request params.
  
  @param string $token
  
  @throws FaultException