If your account has sufficient credits, our system will auto-renew your subscriptions 7 days before the expiry date, and then send you a tax invoice.
If your account has insufficient credits, our system will charge your stored credit card to renew the subscriptions regardless of whether you enable or disable auto top-up.
If your account does not store a valid credit card, the subscriptions fail to renew. And you will receive an auto-generated email notification. If you want to renew your subscription, follow the instruction in the email.