PDFAid Charged Without Consent After Free Trial Use

I used PDFAid only once, and the subscription was activated without my consent. I signed up for what I believed was a one-time service or a free trial, but it was automatically converted into a paid subscription without my permission, resulting in an unauthorized charge of €49 to my credit card. I immediately canceled the subscription that was activated without my consent. I request a refund of the improperly charged amount to my credit card. I am attaching the following: confirmation of the unauthorized charge to my credit card and a screenshot showing that the subscription has been canceled.