Goodnotes App Lost Annual Subscription Access Despite Confirmed In-App Purchase

I use the Goodnotes application on my iPad. Initially, I was using the free version of the app, which allowed a limited number of notebooks. When I wanted to open additional notebooks, a notification appeared informing me that I needed to subscribe, stating that the annual subscription fee was $13. Following this, I completed the in-app payment on December 22, 2025, upgrading my subscription to a full one-year plan.

Following the payment, my subscription remained active without issue for some time; I was able to access my existing notebooks and create new ones. However, when I opened the app today, I noticed that although my old notes were visible, my subscription had vanished as if it had never been purchased. I logged in with my own account, yet the system still directed me toward a seven-day free trial and indicated that I needed to purchase another annual subscription at the same price to add new notebooks or continue working on my current notes. I am completely unable to view or actively use the annual subscription I paid for.

I demand that my subscription be reactivated continuously for one full year starting from the original purchase date, or if this is not possible, that the full $13 amount I paid be refunded to me.