I am getting charged for things I did not purchase.

Every month I’m being charged for large amounts & my bank sends me the message “Your card ending in **** at APPLE.COM/BILL, IRELAND on “date & time” for “amount” is approved”

I've checked my subscriptions and other places where I might’ve saved my card but everything seems normal. The apps I’ve subscribed to are okay and I get the invoices on my email but the other charges I get nothing. I need help with this, has anyone experienced this before?