Every time I go looking for this, it’s impossible to find. So I’m linking it in it’s own post to save all of our sanity. I think the doc does a great job of explaining it all, when you can find the doc itself.
http://developer.anscamobile.com/reference/in-app-purchases
… And I suggest perhaps linking this documentation from
http://developer.anscamobile.com/reference/index/app-purchases which is where I always hoped to find a link to it until I was brilliant enough to make it a link on my desktop. 
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