Apple processes their refunds directly, here are a few simple steps to get you started.
1. Go to http://reportaproblem.apple.com
2. Log in using your Apple ID and password
3. Select the tab - Apps
4. Select 'Report a problem'
5. Click on chose a problem.
6. Enter requested details and submit the request.
Users can expect a refund within a few days of their initial request. Apple support may reach out to verify.