Anyone have experience with refunds from Mac App Store?

[Froge]

Being the imbecile that I am, I bought A:TDD off the Mac App Store, which the HPL2 editor doesn't work on. Yes, I should've checked what HPL2 can run on before I bought the game. Anyways I decided to get A:TDD off Steam instead.

Anyone have experience with what I should do or say to get a refund from Mac App?

Edit: Yes, I just made FG sort of more rich than if I bought Amnesia once.