How do I delete my account?

Settings, Store, Danger zone. Deletion is soft for 30 days in case you change your mind, then permanent: every order, cost rule, report and stored token goes with it, and destroying the stored token is what ends our access to your store.

Take the full account export first if you want a copy; it is included on every plan and covers everything the account holds. Invoices are kept for the seven years Austrian tax law requires, because that duty survives the account itself. Nothing else does.