Paid Subscriptions 
vBulletin Options > vBulletin Options > Paid Subscriptions

Paid Subscription Email Notification
An email will be sent to this email address when a paid subscription is purchased or reversed.
The main Paid Subscription settings are found at Paid Subscriptions > Paid Subscription Manager. The main manual section relating to Paid Subscriptions can be found here
Bryan Ex 20th Apr 2005, 11:03am
While not displayed on this page, WorldPay and subscription services are also included in VB3 in addition to PayPal and NOCHEX listed above.