They take 40% of ad revenue at source, leaving the other 60% for the developer. They offer you an eCPM (clicks per mile) or per 1000 impressions. This seems to be a variable amount, at least based on what I've seen. The revenue column is what you get paid.
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I would assume so, as all the other revenue checking stuff in itunesconnect does.
but it's only a guess.
thanks