Most iOS apps can be purchased within the price of a coffee. But even then, it's important to keep track of everything you buy through iTunes.
There is more than one reason to keep tabs on your outgoing dollars.
Family Sharing brings demands some extra watchfulness. For example, if a family member with existing subscriptions joins Family Sharing, their subscription renewals charge to the family organizer's payment method each time a new subscription period begins.
You could have made an in-app purchase and it does not appear in the app or a pre-order and forgot about it till it called out from the credit card bill. Maybe, you just got double-billed by a subscription provider and want to double-check. Or, you are a careful spender with a budget for monthly app purchases.
A headache? Not necessarily. Apple gives you a quick way to check any purchase you made on iTunes.
Check Your Purchase History
Open iTunes. Sign in with your Apple ID.
From the top of the iTunes window, click Account > View My Account.
Sign-in with your account again. The Account Information page is displayed.
Scroll down to Purchase History. To the right of Most Recent Purchase, click See All. Your entire Purchase History is pulled from the records and is listed after a few seconds.
The listing is chronological with the most recent purchases showing up first. You can filter it by month. To see the details of a purchase, click the arrow to the left of the order date.
The important details in the invoice include date, time, and web order number in the top-right corner. This helps you compare each purchase to your credit card bill.
Note: Family Sharing purchases won't show up on this list. Sign-in with the ID of family members one-by-one to see what other family members bought.
Compare your purchase history (and family members' purchase histories) to your credit card statement. If you still don't recognize the charge or want to request a refund, contact Apple Support.
Do you keep tabs on your app purchases? Did you ever report a problem?