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 have taken contact with Netatmo team, and they respond quickly. On french forum I publish the discussion.
The last one is :
The last phrase is very important, because it is really what we need to resolve all problem. But the fact is that will come after. I am trying to change deadline, in order to have this before shutdown of the olh authentification service. Normaly next week a call with them, in order to clarify that.