Step 1. Download http://www.amiduos.com/
Step 2. Run DuOS
Step 3. Sign into amazon appstore with your amazon account.
Step 4. Download Hearthstone.
Step 5. Run Hearthstone.
Step 6. Sign into Hearthstone with Battle.net account.
Step 7. Buy anything with debit or amazon gift card.
Step 8. Goto https://www.amazon.com/gp/help/contact-u...?skip=true
Step 9. Select Digital Services, Apps and Appstore, Payment.
Step 10. Goto Live Chat
Step 11. Tell them your brother bought it. (After the first time just say it glitched, pretend like you don't know what you are doing.)