Multi level subscriptions

Hi,

I'm interested in using your membership plug-in and I've checked the features and any relevant posts but wanted to check if it has the following functionality/features:-

1. I require something similar to multi-level subscriptions.
2. I need to offer each member the option to purchase a yearly subscription which I understand your plug-in offers. However I then need an option for each member to purchase credits so they can access 'private' website pages.

Therefore each member would be charged a yearly subscription but on top of that they also need to purchase credits to access 'private' website pages.

Is this something the membership plug-in offers?

Regards
SteveB