I’d like to request a refund on a accidental purchase I made

no my child 7 year old accidentally purchased

All you can do is try using the link provided. You are still responsible for purchases made on your device if you have given anyone your passcode/password. There are many ways to prevent purchases, you just need to use them:

• Ask to Buy - Approve what kids buy with Ask to Buy - Apple Support
• Require Password for purchases - Require a password for App Store and iTunes purchases - Apple Support
• Parental Controls - Use parental controls on your child's iPhone and iPad - Apple Support

The method used will depend on if it was with your device or was made on the child's device.

If you got an email receipt, use the 'Report a Problem' link in it. Otherwise, click here and ask the iTunes Store staff for a refund.

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no my child 7 year old accidentally purchased