Refund request for an unauthorized subscription linked to my Apple Account?

Hello, can anyone help me? I downloaded an app the other day, just to have a look at it? I was about to delete it, because I couldn’t see properly? As I had Stents put in my eyes 2 days ago. I have been Charged $49.99 and I wasn’t warned about this charge, and I won’t be using the app as I don’t have a Garden?

I would appreciate a Refund, as I’m a Pensioner and don’t download very often?

Thank You

[Edited by Moderator]