Don’t bother
Response from developer
Hello! The app has a free 3-day trial, and you can choose whether to subscribe as a member according to your own needs. When you authorized the trial, you were informed of the expiration date of the free trial, which is not mandatory consumption. To avoid being charged, please make sure to cancel one day before the end of the free trial. You can cancel at any time in "Settings">"Apple ID">"Subscription". If the subscription is not cancelled after this date, the system will automatically deduct the fee.