Apple makes sure you don't end up buying an app “accidentally” by asking you to enter the password when you purchase an item. But should you buy an app only to find out that this wasn't the one you were expecting to buy, you can file for a refund claim.
Apple reviews the refund claim before granting or declining the request. A lot of people do not know how to request for a refund for a purchase. You can extend this to music/videos too.
How to Request Refund for iTunes or App Store Purchases
One of the easiest ways to request for a refund is from the purchase confirmation email you get from Apple. To request for a refund, you can click the Report a Problem link from your email. If you don't have the email or if you didn't get one, follow these steps.
Step #1. Open iTunes on your Mac or Windows machine.
Step #2. Select App store (or Store) from the top menu.
Step #3. Now, from the Quick Links section, select Account. Alternatively, you can also go to this page from the menu bar item: Store → View Account.
Step #4. If prompted, enter your iTunes account password.
Step #5. Scroll down to the bottom of the page there's Purchase History. Click on View All to see all your purchased apps.
Step #7. Select the app that you want to request a refund for.
Your request will now be reviewed by Apple. Note that not every purchase is refunded by Apple. And the final decision rests with them.