Recently, we very often receive the server response “429 Too Many Requests” when we post to https://api.nuki.io/oauth/token. Is this a general server problem or is it specifically related to our requests (is there an IP limit)?
Yes, there is an IP limit, depending on the endpoint. The issue is, if you ignore 429 requests the blocked time will continue to increase.
If you can PM me the Nuki Web account used for the integration I can let somebody check the logs for when and how we see you running into those limits.