Unknown periodic charge on my credit card
Hello,
I have found an unknown periodic charge on my credit card, labeled ITUNES.COM/BILL ITUNES.COM, of 1.98 Euro, something like 2or 3 times at month. I tried to check on my iTunes account but found nothing justifying that. How can I know the reason for this charge? Thanks.
OS X Yosemite (10.10.5)