In my latest Shopify tutorial video I show you how to setup a paid membership for users using Shopify and some simple rules. In order to complete the tutorial you'll also need the Role Expire and Conditional Rules modules.
The Shopify eCommerce module integrates Shopify with your Drupal site. Manage your store in Shopify. Manage your content in Drupal.
Shopify is an easy to use, all in one system for selling online. Learn more at shopify.com