Subscription/Membership Upgrade
Customers can upgrade a subscription/membership at any time. If the account has a past due balance please CANCEL the subscription first (as per instructions above), and then proceed to rebill.
https://docs.google.com/document/d/1m1BbZtHL5DHsCHIK9dGHvcBJX6_riu6FCcsc7FDZNlU/edit#heading=h.hy67d4nvz9if