how to disable credit card sharing for one member
How can i stop sharing my credit card with just one family member but not others?
iPad Air 3 Wi-Fi
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If you are the organizer, you can't. You can ask the individual to buy/redeem App Store/iTunes Gift cards to their account to pay for their purchases. The cost will be taken from the account balance before your credit card is charged.
App Store & iTunes Gift Cards by Email