Audit changes nothing it audits and sends nothing to anyone. It is not a statutory audit and gives no audit opinion. Approving a plan, issuing a report, accepting a risk and sending a pack to your auditor are yours, here.
Your licence renews into the next year by default, paid the same way. Turn this off before the year ends if you don't want the next year. While card payments aren't open, renewal sends you an invoice. It never charges a card.