Once you have published a card on the Stamp Me platform (and you are either in a trial or on a paid plan), your Stamp Card will be marked with a green 'active' status. This displays under the Stamp Card name on the Stamp Cards area of the Merchant Console.
Active means your Stamp Card is live on the Stamp Me app and it can be used for testing, or with real members.
You will be billed for your active cards as per the schedule shown in the manage my subscription area of your Merchant Console.
If you don't want your active card to appear publicly on the Stamp Me in-app search feature, you can set the card to private.