Authenticator: If you’d like to keep it enabled once it’s your turn for service you’ll be notified via that what you left as “contact” while ordering.
You’ll be given 10minutes to request a chat and tell us the auth code, if you’ll be late order will be skipped.
Jagex account: Same rule applies to Jagex Launcher, on checkout page you can also provide us backup code so you don’t have to be online to be served. Keep it in mind one backup code can be used only once, it’s recommended to send 2 codes in case of re-logging in the process.