PCI (Protection of Cardholder Information) standards require that you generate a new encryption key at least once a year. You must perform this task annually to maintain PCI compliance, and you can use this feature in ProductCart to do so.
When you generate a new encryption key:
Existing data will remain encrypted with the current encryption key
New data will be encrypted with the new key that you are about to generate
ProductCart will be able to unencrypt both old and new data