Get to know DotNetNuke 7 - Admin / Advanced Settings / Payment Settings
2 min : 25 sec
This video will show you that the payment settings under Admin / Advanced Settings don't really work. That's it! That is why the video is so short.
If you would like to setup subscriptions or membership fees on your DNN site you better go with a 3rd party module like the one I show on this other video: How to setup a Subscription Website in DotNetNuke.