We have no way to send an order to checkout that would initiate auto-recurring payments, and even if we could, our system has no useful way of handling subsequent payments after the buyer's initial checkout anyway. You may wish to investigate PayPal's Recurring Payments solution, which is what we use to manage recurring subscription payments from sellers for the use of our own services.
When we use PayPal Recurring Payments for subscriptions to our own service, all we really do is set up PayPal's subscription buttons in our Admin panel's subscription screen. When you click our Subscribe button for the plan level you want, that sends you to PayPal's site, where you log into your account and approve setting up the automatically recurring payment schedule in your own PayPal account. This instructs PayPal to blindly send us the same amount every month with a reference to your E-junkie client ID, so we do nothing to "charge" you, and we really have no control over the payments other than configuring the Subscribe buttons to set up the payment schedule properly in your PayPal account in the first place. PayPal also sends us an IPN for these payments, so we have a simple script that passively receives those IPNs as a trigger to keep your E-junkie account active for another month.