Western Studios has released it's free phpnuke paypal subscription module. It is one of the easiest module you will ever install, there are no edits to nuke core files.

Features:
admin
-Automatically approve subscribers after payment or manually approve.
-Add subscription to any phpnuke member.
-Delete or add/minus days from subscribers.
-Create multiple subscriptions.
-Display all subscribers with search feature.
-Earnings report.
-Integrate NSN Groups.
-Allow new member sign up only when subscription is paid.
-Much more....



User
-One click subscribe
-Ability to register and allowed entry to website once payment is successful.
-More...

Minimum 2 posts required
You can get it at the link below
Western Studios