You can also Redeem for Value. Example: Someone purchased a Botox Package of 100 units for $1,000. A few months later, the found out they no longer could receive Botox but they already paid for the package. The clinic can decide to redeem for value and use that package cost towards the cost of any other visit.
This patient came in and the total for today's visit was $180. The clinic can take $180 out of the pre-purchased $1,000 Botox package and use it towards todays visit. After today, it will show the patient has $820 left in this package (which can still be redeemed as Botox units or redeemed for value.)