Child made purchases
My son made unauthorized purchases with Roblux. Where do I go to get my money back?
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You can try the following: Request a refund for apps or content that you bought from Apple - Apple Support
Also see this information from that link:
If you or a family member bought an item by mistake, set up Screen Time to prevent unintentional purchases in the future. You can require a password for purchases, prevent some types of purchases, or disable purchasing completely. Set up Screen Time.