How do expired/expiring subscribers renew their service?
Subscribers can renew their service by logging in to the Subscriber Portal and clicking a button presented to them upon login. The button will be Extend Service Period for those not-yet-expired or Re-Activate Account for accounts that have lapsed.
When the subscriber receives your reminder text or email, they need to log in to the Subscriber Portal and extend their service period.
When the subscriber clicks the renew/re-activate button, their service is renewed for one year. (Then they must repeat the process every year to keep their account active.)