Does Amazon refund credit from canceled orders?


I ordered a copy of Red Dead a few days ago with $20 Amazon credit. Now, however, I'm thinking I'd rather put that towards Peace Walker. The order hasn't shipped yet, and I was wondering if anyone knew whether I would retain the $20 credit if I cancel Red Dead.
Thanks for any help, and sorry if this is the wrong place to ask, I've never wandered out of the deals forum until now and this seemed like the best place.
If you cancel the order before the item ships you should.

I ordered the wrong version of Red Dead and cancelled to reorder correct version and got my $20 credit back instantly.
bread's done