Reactivating Your Canceled Subscription
If your subscription is canceled and you want to reactivate the billing, this is done by 2checkout, and requires you to contact them directly.
This is what 2checkout says:
For privacy and security reasons, billing information on recurring orders can only be changed by the customer. If you wish to change or update the billing information on a recurring order, please open a support ticket or call Customer Care anytime. Our Customer Service team is available 24 hours a day.
Or you can go directly to this secure page: