MissingAppSecretException example

if ($app === null) {
            throw new AppByNameNotFoundException($appName);
        }

        $shopUrl = EnvironmentHelper::getVariable('APP_URL');
        if (!\is_string($shopUrl)) {
            throw new MissingShopUrlException();
        }

        $appSecret = $app->getAppSecret();
        if ($appSecret === null) {
            throw new MissingAppSecretException();
        }

        $targetUrl = $requestDataBag->get('url');
        $targetHost = \parse_url((string) $targetUrl, \PHP_URL_HOST);
        $allowedHosts = $app->getAllowedHosts() ?? [];
        if (!$targetHost || !\in_array($targetHost, $allowedHosts, true)) {
            throw new UnallowedHostException($targetUrl, $allowedHosts, $app->getName());
        }

        $action = new AppAction(
            $targetUrl,