Hi Raphael,
The API does not return a response body as it operates asynchronously. To obtain updates after you perform actions, we recommend using our Webhooks.
To gain access to our webhooks, you’ll need to enable the “Advanced API”. To do so, log in to your Nuki Web account and navigate to the “API” menu. There you’ll find a tab for the Advanced API where you can request access. After access has been granted, you’ll be able to start using webhooks.
You’ll also find a link to the Webhook documentation here.