Aura's yearly plan includes a seven-day free trial. It becomes a paid yearly subscription when the trial ends unless you cancel at least 24 hours before the last day. The weekly plan starts immediately and does not include a trial.
To cancel a trial, follow the cancellation steps above. Cancelling doesn't end the trial early, so you keep access for the remaining days.
Trials are one per person. If you've had one before, Apple may not offer another.