I believe that all current Solutions for Netatmo integration to Fibaro use Client Credentials grand type which Netatmo plans to remove in October 2022. I see this as a big setback for all home automation integrations. Security is always important and any improvements are most welcomed. Maybe they could do better by removing sending username and password and allowing local connection between home automation gateways and Netatmo devices, but it seems that local connection will never be provided.
I do not know how to solve it and even worse I think there is no easy solution, I do however know a "auth flow" on Home Assistant, and this might give you some clues as to why the "redirect" url exist. It is indeed the final step to "receive" the token used for oauth
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The gist of it is this:
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IMHO the key points are
1) When you are on the server site (eg Netatmo) you have t