With this feature, you have the ability to auto-expire a membership card to give them a limited time experience, while coupled with a campaign to upsell them to a paid plan. To set this up, simply go to the Membership Program and set the Auto Expire to the duration the ID card should auto expire.

If you don't see this under settings, then make sure you have selected an ID card. This feature is NOT available for subscriptions (you can leverage the trial feature on the service).