Hi there, @EnFuego.

Allow me to step in help provide clarification if there's a way to notify your customers about their expiring rewards.

Currently, POS is designed to email sales receipts only. We don't have any features yet in sending an alert if the customer's rewards are about to expire. 

Please let me know if you have additional questions about the Rewards Program. You can also check out this helpful article in case you need information about rewards in the future: Manage Point of Sale Customer Rewards.

I'll always be here to help if you need anything else. Have a good one.