Right now we can only handle recurring/subscription payments using Stripe. Our system would only be able to process an order for the initial payment, then Stripe would process the subsequent payments at their end without informing us, so we would only be able to issue an activation code for the buyer's first payment but not for any subsequent payments.
Also, this is a brand-new feature that our Developers would need to set up manually for you, so if you're interested please contact us with your product name, the subscription amount, and whether it is to be billed weekly, monthly (or any other billing period).