saveAppSecret example

if (!$manifest->getSetup()) {
            return;
        }

        try {
            $appName = $manifest->getMetadata()->getName();
            $appResponse = $this->registerWithApp($manifest, $context);

            $secret = $appResponse['secret'];
            $confirmationUrl = $appResponse['confirmation_url'];

            $this->saveAppSecret($id, $context, $secret);

            $this->confirmRegistration($id, $context, $secret, $secretAccessKey, $confirmationUrl);
        } catch (RequestException $e) {
            if ($e->hasResponse() && $e->getResponse() !== null) {
                $response = $e->getResponse();
                $data = json_decode($response->getBody()->getContents(), true);

                if (isset($data['error']) && \is_string($data['error'])) {
                    throw AppException::registrationFailed($appName, $data['error']);
                }
            }