That actually happened to me not long ago, and I was confused for a bit too because the description on the bank statement isn’t very detailed. In my case it turned out to be a subscription I started months earlier and completely forgot about. I eventually found a helpful explanation about amazon digital charges and how they appear on statements while searching online, and this page about an amzn digital charge explains the common reasons and where to check inside your account to see what service it belongs to. After reading it I checked my digital orders and subscriptions section and it made much more sense. Sometimes it’s things like streaming, Kindle content, or small in-app purchases, so it’s worth looking through those sections before worrying that something is wrong.