When your billing cycle is over, a recurring payment is collected from your account. Generally, it is charged the same day every month — the day you paid for the subscription for the first time. However, if your credit card has expired or if you've canceled it and haven't provided new payment details, we cannot charge you on the due date. In this case, your account is immediately moved to "a grace period." It's a 14-day period when you can smoothly resolve payment issues while continuing to use Setapp.
By the way, sometimes connecting to the Internet may be enough to stop your grace period. It works if you have been billed successfully but Setapp on your Mac haven't received a required payment confirmation because you are offline.
Anyway, if the billing issue is resolved during the grace period, nothing more than a regular fee is collected from your account. Otherwise, your account is getting suspended until the moment you decide to renew it.
Reactivating the account is as easy as clicking the "Renew subscription" button on the Subscription page of your online Setapp account. Note that you'll be charged a little more than your regular subscription fee after renewal. To be more precise, you'll need to pay your regular fee, plus 14-day of grace, plus taxes. Thus, if you pay a regular $9.99 monthly fee, then your renewal payment will constitute approximately $14.50 - $14.65.
Note that our Support Team is always ready to assist you if any help is needed.