src/Http/Client/Guzzle/RequestBuilder.php
protected function buildForVersionThree(RequestInterface $request)
    {
        if (get_class($this->guzzleClient) === GuzzleClient::GUZZLE_THREE_CLIENT_CLASS
            && method_exists($this->guzzleClient, 'createRequest')) {
            $this->guzzleReCaptchaClient->setVersion(Version::VERSION_THREE);
            return $this->guzzleClient->createRequest(
                $request->getMethod(),
                (string)$request->getUri(),
                $request->getHeaders(),
                $request->getBody()->getContents()
            );
        }

        return null;
    }
protected function buildForVersionThree(RequestInterface $request)
    {
        if (get_class($this->guzzleClient) === GuzzleClient::GUZZLE_THREE_CLIENT_CLASS
            && method_exists($this->guzzleClient, 'createRequest')) {
            $this->guzzleReCaptchaClient->setVersion(Version::VERSION_THREE);
            return $this->guzzleClient->createRequest(
                $request->getMethod(),
                (string)$request->getUri(),
                $request->getHeaders(),
                $request->getBody()->getContents()
            );
        }

        return null;
    }
Build request object for Guzzle 3.*

@param RequestInterface $request
@return mixed