Redirect and approval behaviours in several places - which to choose?

Hi!

I find my changes to the account activation method and redirect/login behaviour in Payplans doesn't always work as expected, and while troubleshooting I realize there are similar settings in multiple places, including:

System/Global Config/Users/
- Account activation
- Send email to admin

EasySocial/Users/Profile Types/
- Login Redirection
- Registration Type
- Redirection Upon Registration
- SSO Registration Type
- Send emails

PayPlans/Settings/General/Checkout (when using default integration)
- Account verification
- Activation Redirect URL (default registration)

PayPlans/Settings/General/Users
- Redirect for subscribers
- Redirect for Non subscribers

Payplans/Plans/Plans/Details
- Redirect URL


I keep making changes in all these places, which is probalby one reason I get unexpected results. Which settings overrule others, in what order and in what sitiuations?