Goodnotes App Subscription Charged Overnight Without Prior User Authorization

Regarding the Goodnotes application I use on iOS, I noticed that an unauthorized payment was charged to my account even though I did not start any membership subscription. During the night, a transaction of $13 appeared in my App Store purchase history, and I never gave approval for any service or subscription associated with this charge.

Due to my busy schedule, I have not been able to contact Goodnotes support or Apple Support until now. I do not accept such uncontrolled and unauthorized charges being made from my card when I haven't initiated any membership.

I demand the cancellation and immediate refund of the unauthorized $13 payment, as well as the termination of any hidden or automatically renewed subscriptions linked to my account. Furthermore, I request an explanation as to how and under what justification this unauthorized transaction took place.