I have a recurring charge of $6.55 that I can't identify. How can I find out what the charge is for?

Have you checked your subscriptions?

Purchases - View, change, or cancel your subscriptions.      *

Purchases - Subscriptions not billed through Apple    *

Link to contact Apple Support at the end of the article.

Purchases - the subscription that you want to cancel is not listed    *

See the Apple Support article(s) below. Link to contact Apple Support in the article.

Apple ID - If you see ‘itunes.com/bill‘ or an unfamiliar charge on your bank, credit card, or debit statement.    *

Read the last link I posted. Link contact Apple Support at the end.