If you have the intention to refund the underage game after recharging, you can consult Apple Customer Service. If the problem cannot be solved, parents can take the other party as the defendant to file a lawsuit to confirm that the recharge game is invalid or the effect is to be determined.
According to the relevant laws and regulations, no matter how much money minors under 8 use to recharge the game, it is an invalid civil legal act and can ask for a refund. Minors over 8 years old 18 years old can't ask for a refund if the recharge amount is suitable for their age and intelligence, and can ask for a refund if it is not suitable.