Paid Subscription Cancellation Question

[vb_mp]

Hi,

I have a paid recurring subscription on my forum. When a user pays they are moved into a "Paid Subscriber" usergroup.

If they cancel their recurring subscription via PayPal, I would like to be able to move them back on Subscription expiration date to "Registered User" usergroup.

Does anyone have ideas how I can do this?

I don't want to move them back when the IPN comes in from PayPal when they cancel their subscription but rather on the date their existing subscription runs out.

Thank you,

vb_mp