Unwanted payment

That is highly doubtful. Your Apple ID account was used to make a purchase or add a subscription. Either you did it, someone you share an Apple ID with did it, or your Apple ID was hacked.

For instructions to see what it was for click on this Apple support link—>See your purchase history for the App Store or iTunes Store - Apple Support

If you think your Apple ID was hacked see this link—>If you think your Apple ID has been compromised - Apple Support

Someone used your device to buy something.

You have to control it.