Clickbank Integration
 

Integrating Clickbank into the payment options would be amazing.

Extra feature - If the user ends up on your forum via a clickbank affiliate link, then Clickbank should be the only available payment option for that user's paid subscriptions.

Or even avoid the paid subscriptions all together and somehow create a button that sends parameters to clickbank to initiate a sale, and return it when the sale is complete, automatically upgrading the account that initiated the sale...