src/Server/Guard.php
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);
        }
    }
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);
        }
    }
Validation request params.

@param string $token

@throws FaultException