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A module for collecting subscriptions for content on a PostNuke website. The module is set up to work with PayPal's Instant Payment Notification (IPN) so that subscribers are automatically added to groups without administration intervention. The function that performs this uses security measires to prevent hacking.  

 In my testing, this module is ready to go, but I need other people to test it and give me feedback.

WebsiteFee is an open source module for integration with PayPal's subscription service that is capable of using IPN to automatically manage subscriptions. After setting up the service, users can click on a PayPal subscription button that you create and sign up for a specific PostNuke group. By using the PostNuke permission module you can the grant this group access to your restricted content. The steps need to make this work are..

1. Register with PayPal to use the subscription service.

2. Create an appropriate PayPal button that contains a custom field configured for the WebsiteFee module. This custom field must specify the username and a unique tag that identifies what the user is subscribing to. You should also specify the IPN notification function that PayPal sends the notification to. This is normally WebsiteFee_user_paypalsubscribe.

3. In the WebsiteFee module, create a subscription item that identifies the item's price, the email that is registered with PayPal for the seller, The group ID to which a subscriber should be registered and the tag that identifies the item that is to be subscribed. This tag matches the unique tag in the custom field of the button.

4. Create the permission rule that gives a paying user access to your restricted material.

5. Place the button in any spot in your website. When a user submits a payment using PayPal, the WebsiteFee module is automatically notified, checks to make sure the transaction is legitimate and records it. It also adds the user to the specified group.

This module has been designed such that it can be expanded to include other payment services by writing the appropriate functions in the pnuser.php file.