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 or involving us at all.
That's a brand-new experimental beta 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).
You can also use PayPal Recurring Payments with PayPal's own Subscription buttons at the same time as using E-junkie with PayPal to sell unrelated products. They won't interfere with each other at all, but bear in mind our system would be entirely uninvolved in such transactions. This help page provides further detail and suggestions: