getWebhookHeaders example

$eventName = 'AppFlowActionEvent';
        $headers = [
            'Content-Type' => 'application/json',
        ];
        $payload = [
            'name' => 'value',
        ];

        $event = new AppFlowActionEvent($eventName, $headers, $payload);

        static::assertEquals($eventName, $event->getName());
        static::assertEquals($headers, $event->getWebhookHeaders());
        static::assertEquals($payload, $event->getWebhookPayload());
        static::assertTrue($event->isAllowed('11111', new AclPrivilegeCollection([])));
    }
}

/** @var string $jsonPayload */
            $jsonPayload = json_encode($webhookData, \JSON_THROW_ON_ERROR);

            $headers = [
                'Content-Type' => 'application/json',
                'sw-version' => $this->shopwareVersion,
                AuthMiddleware::SHOPWARE_CONTEXT_LANGUAGE => $languageId,
                AuthMiddleware::SHOPWARE_USER_LANGUAGE => $userLocale,
            ];

            if ($event instanceof AppFlowActionEvent) {
                $headers = array_merge($headers, $event->getWebhookHeaders());
            }

            $request = new Request(
                'POST',
                $webhook->getUrl(),
                $headers,
                $jsonPayload
            );

            if ($webhook->getApp() !== null && $webhook->getApp()->getAppSecret() !== null) {
                $request = $request->withHeader(