Hi,
It's been implemented and it's working. If you have problems, let me know.
BUT, you have to be prepared, that even within a working system, IAP is really tuff to get in, so you need to be prepare for some quite painfull moments especially if you have never worked with IOS before. Their docs and everything is a real pain at first...
Don't want to scare you, but this is definitly something to be aware of.
bye,
Jean