Ask to buy issues
ask to buy was working fine but recently my 11 yr old daughter can now download apps without my permission and can pay for apps using my visa!! I cannot delete my visa as a payment method from her account either!
iPhone 14, iOS 17
Try turning it off and back on again.
How to turn on or turn off Ask to Buy, from Set up Ask to Buy - Apple Support
If you're a parent or guardian, use your own device to turn on or turn off Ask to Buy.
On your iPhone, iPad, or iPod touch
1. Open the Settings app.
2. Tap your name.
3. Tap Family Sharing.
4. Tap your family member's name, then tap Ask to Buy. In iOS 15 or earlier, tap Ask to Buy then tap your family member's name.
5. Turn on or off Require Purchase Approval.