IgnitionDeck Commerce is a full digital commerce platform and membership management plugin for WordPress that makes it easy to display and deliver digital content. Our Mailchimp integration automatically subscribes new customers to your Mailchimp email list so you can maintain communications beyond the initial sale.
You can also segment your subscribers to understand which are still only owning a 'free' product and have not yet bought anything. With this under your belt, you can send a newsletter announcing a sale to just your free members.