*Anything that changes a customer's points balance is considered "activity" and will prevent your points from expiring. This includes earning more points (whether from placing orders, celebrating a birthday, etc), redeeming points (for discounts), or manually being issued points.

A customer's entire points balance expires all-at-once, and each individual point earned does not have it's own specific expiry date. The date that a customer's points balance expires is based on whichever is the later of:
The date of the customer's last activity, OR
The date points expiry was enabled
The points expiry period is then added to this date to determine when the customer's points balance will be reset to zero if no further activity occurs. If additional activity occurs before the expiry date, then the expiry date is recomputed and no points are removed in the meantime.