When using Website Payments Standard, there are two different types of payments you can set up and use. There are subscriptions which allow you to create a profile and bill the buyer on a recurring basis. With subscriptions, this service is free to use with Website Payment Standard, but keep in mind that the buyer will need to have a PayPal account or create one when they sign up.
The other service is Enhanced Recurring Payments which can be added onto your account. There is an additional monthy charge for this service. This service would work similar to subsriptions but you would also be able to set up Automatic Billing and Installment Plan buttons. Also with Enhanced Recurring Payments your buyer does not have to have a PayPal account. They can use their credit card directly.