The following plugin enables you to provide your users with paid access to the content published on your website.
The Instagage button allows you to get paid to communicate with your visitors using built in time tracking and automated billing.
Cred is a payment system for WordPress that allows you to monetize your content or digital media (such as e-books, music or videos) through micropaym
Provides an all-in-one registration point for subscribers to your blog. Uses Paypal API and recurring billing.