How can I avoid unwanted/unauthorized charges from App Store?

The only way Apple attempts to take money from you is if you tried to purchase an app, made an in-app purchase or downloaded an app with a free trial and forgot to cancel it before it turned into a paid subscription.

If you did any of these things, then you now owe Apple the amount.

If you have a pending payment that has been unable to be charged to you, it will remain Pending until it can successfully be charged. It will never be removed or stop being in "Pending" status. You must fulfill the legal contract you entered into with Apple and pay whatever it is you now owe.

Once its successfully charged and paid, you can request a refund for it. If its a subscription, you will need to cancel it before requesting a refund.

click here ➜ If you want to cancel a subscription from Apple - Apple Support

and here ➜ Request a refund for apps or content that you bought from Apple - Apple Support

Are you certain the charges are from Apple, and not a scam?

https://toughnickel.com/scams-fraud/Apple-iTunes-866-xxx-xxxx-Scam

https://finance.yahoo.com/news/check-credit-card-statements-scam-172745615.html

https://candid.technology/866-xxx-xxxx-scam/

https://wntoknow.com/why-do-you-see-866-xxx-xxxx-on-credit-card-bill/

Does the charge line on your credit card statement match any of the following used by scammers?

These are all of the known scam charge lines. There may be more.

CHKCARDAPPLE COM BILL CUPERTINO CAUS

CHECKCARD APPLE COM BILL CUPERTINO CAUS

POS Debit APPLE COM BILL CUPERTINO CAUS

POS PUR APPLE COM BILL CUPERTINO CAUS

POS PURCH APPLE COM BILL CUPERTINO CAUS

POS PURCHASE APPLE COM BILL CUPERTINO CAUS

POS REFUND APPLE COM BILL CUPERTINO CAUS

PRE-AUTH APPLE COM BILL CUPERTINO CAUS

PENDING APPLE COM BILL CUPERTINO CAUS

Visa Check Card APPLE COM BILL CUPERTINO CAUS MC

Misc. Debit APPLE COM BILL CUPERTINO CAUS

CHKCARD APPLE COM BILL CUPERTINO CAUS

APPLE.COM/BILL 866-712-xxxx CAUS

APPLE.COM/BILL 866-712-xxxx, CA, USA

APPLE COM BILL CUPERTINO CA

APPLE COM BILL CUPERTINO CAUS

APPLE.COM/BILL INTERNET CHARGE CA QUAN B NGUYEN -88006

APPLE.COM/BILL IRL CORK

APPLE.COM/BILL wwx.aplle.cxx CA

(had to x out some of the last one to prevent it from being an active link)

If you have charges on your credit card for this charge line, but no matching items actually charged by Apple, then your credit card has been compromised. Contact your card issuer. Have them reverse the charges if possible, then immediately cancel that card and have them issue you a new one.