I was charged $13.16 on 10/11 and I need to know what that is for.

Hi there sunny8625,

We’re happy to see that you posted in the Apple Support Community. We understand you’re wanting to track down that unrecognized charge. We’re happy to guide you.

Try the steps here: If you see 'apple.com/bill' on your billing statement

Still unable to figure it out? Please reach out for additional assistance here: Get Support

Have a good one!