To contact Apple Support for a refund due to an Apple Pay purchase, you can follow these steps:
1. Open the "Apple Support" app on your iOS device, if you have it installed. If not, you can download it from the App Store.
2. In the Apple Support app, tap "Get Support."
3. Scroll down and select "Apple Pay" as the product or service you need help with.
4. Choose the option that best describes your issue. In your case, it might be "Refunds & Returns" or "Unauthorized or accidental purchase."
5. Follow the prompts and provide the necessary information to explain the situation. Be sure to mention that it was your younger brother who made the purchase without your consent.
6. Apple Support will guide you through the process of requesting a refund. They may ask for additional details to verify the situation.
7. You can also choose to contact Apple Support through other means. Visit the "Contact Apple Support" page on the Apple website https://getsupport.apple.com where you can initiate a chat or request a call from an Apple representative.
Remember to be clear and provide all relevant details about the unauthorized purchase to improve your chances of receiving a refund. Apple Support should be able to assist you with the refund process.