With the new subscription features Shopify has, we've built out an integration between PayWhirl Recurring Payments and our app, Upsell Wizard. Now you can upsell one-time purchases and subscriptions based on products your customers are already buying.
Upsell Wizard App: https://apps.shopify.com/upsell-wizard
PayWhirl App: https://apps.shopify.com/paywhirl
Here's a video we put together about how to set it up:
