So I accidentally bought the app Omnifocus from the Mac App Store (it's an 80 dollar app) and I immediately sent an email to apple saying that I bought it by accident and if I could get a refund. I got a reply within 30 minutes saying they will give me back the eighty dollars. I looked at the iTunes store and sure enough, I got the eighty dollars back. However, I still own the app and it is usable. Is this normal? Does the app disappear? Thanks.