src/Publisher.php
private function sendRequest(RequestInterface $request, int $attempt = 0): \Psr\Http\Message\StreamInterface
    {
        if ($attempt >= $this->options->get('max_attempt')) {
            throw new \Exception('MAX attempt reached for ' . $request->getUri() . ' with payload ' . (string) $request);
        }

        try {
            $response = $this->httpClient->send(
                $request,
                [
                    'allow_redirects' => false,
                    'synchronous' => true,
                    'curl' => [
                        CURLOPT_FORBID_REUSE => true,
                        CURLOPT_MAXCONNECTS => 30,
                        CURLOPT_SSL_VERIFYPEER => false,
                        CURLOPT_SSL_VERIFYSTATUS => false,
                    ],
                ]
            );
            if ($response->getStatusCode() === 200) {
                return $response->getBody();
            }

            return $this->sendRequest($request, $attempt++);
        } catch (ClientException $err) {
            if ($err->getResponse()->getStatusCode() === 401 && $request->getRequestTarget() !== self::AUTHENTICATION) {
                $this->renewAuthToken();
                return $this->sendRequest($request, $attempt++);
            }

            throw $err;
        } catch (\Throwable $err) {
            throw $err;
        }
    }
private function sendRequest(RequestInterface $request, int $attempt = 0): \Psr\Http\Message\StreamInterface
    {
        if ($attempt >= $this->options->get('max_attempt')) {
            throw new \Exception('MAX attempt reached for ' . $request->getUri() . ' with payload ' . (string) $request);
        }

        try {
            $response = $this->httpClient->send(
                $request,
                [
                    'allow_redirects' => false,
                    'synchronous' => true,
                    'curl' => [
                        CURLOPT_FORBID_REUSE => true,
                        CURLOPT_MAXCONNECTS => 30,
                        CURLOPT_SSL_VERIFYPEER => false,
                        CURLOPT_SSL_VERIFYSTATUS => false,
                    ],
                ]
            );
            if ($response->getStatusCode() === 200) {
                return $response->getBody();
            }

            return $this->sendRequest($request, $attempt++);
        } catch (ClientException $err) {
            if ($err->getResponse()->getStatusCode() === 401 && $request->getRequestTarget() !== self::AUTHENTICATION) {
                $this->renewAuthToken();
                return $this->sendRequest($request, $attempt++);
            }

            throw $err;
        } catch (\Throwable $err) {
            throw $err;
        }
    }
actually send request created here, separated for easier attempt count and handling exception

@throws \Exception
@throws \GuzzleHttp\Exception\ClientException
@throws \GuzzleHttp\Exception\BadResponseException