Looks like Apple's commission is ~15-25 BPS for participating banks

   The biggest “surprise” over last 2 months is that Apple has squeezed 15-25bps from the 5-6 participating banks at launch (C, BAC, COF, JPM, Amex and perhaps WFC).

http://blog.starpointllp.com/blog/?p=3855

I am confused by this as well. I thought apple did not allow people to make credit card purchases within an app, am I wrong or will these rules change? Where is the line drawn for using an IAP vs Apple Pay (where I presume Apple takes no cut)