src/Publisher.php
private function renewAuthToken(): self
    {
        $request = new \GuzzleHttp\Psr7\Request(
            'POST',
            self::AUTHENTICATION,
            $this->options->get('default_headers'),
            $this->createBodyForRequest([
                ['name' => 'grant_type',
                    'contents' => 'client_credentials', ],
                ['name' => 'client_id',
                    'contents' => $this->clientId, ],
                ['name' => 'client_secret',
                    'contents' => $this->clientSecret, ],
            ])
        );

        $token = (string) $this->sendRequest($request);

        $token = json_decode($token, true);

        if (empty($token)) {
            throw new \Exception('Access token request return empty response');
        }

        if (! empty($this->tokenSaver)) {
            $this->getTokenSaver()(
                $token['access_token']
            );
        }

        return $this->setAuthorizationHeader(
            $token['access_token']
        );
    }
private function renewAuthToken(): self
    {
        $request = new \GuzzleHttp\Psr7\Request(
            'POST',
            self::AUTHENTICATION,
            $this->options->get('default_headers'),
            $this->createBodyForRequest([
                ['name' => 'grant_type',
                    'contents' => 'client_credentials', ],
                ['name' => 'client_id',
                    'contents' => $this->clientId, ],
                ['name' => 'client_secret',
                    'contents' => $this->clientSecret, ],
            ])
        );

        $token = (string) $this->sendRequest($request);

        $token = json_decode($token, true);

        if (empty($token)) {
            throw new \Exception('Access token request return empty response');
        }

        if (! empty($this->tokenSaver)) {
            $this->getTokenSaver()(
                $token['access_token']
            );
        }

        return $this->setAuthorizationHeader(
            $token['access_token']
        );
    }
renewing access_token

@throws \Exception