Hi Clofy,
Great explanation thanks for the time!
One comment though, you should add the subscription center URL from the content settings, not directly as any other Marketing page. The content settings is a special entity devoted to content parametrization (think of controlling centrally your Facebook or Twitter links in your emails, etc.)
this will give various advantages:
- you can reuse your email with different subscription center pages (depending on your needs) without changing it or creating new ones (the content settings is passed by the journey using the emails, it's not hard coded in the content)
- the unsubscribes count will be more precise
- you can manage your subscription centers centrally by managing the content settings records, without touching the emails or other entities
Just a quick note :)
M