(keitai-l) ecommerce on mobile ("m-commerce")

i was looking at some of the previous posts entitled "Re: Any other models 
apart from subscriber fees", but couldn't find the answer to my question.

besides subscriber fees for monthly services (paid via docomo), how exactly 
are consumers purchasing one-time sale items using their keitai?  (this 
question pertains to all 3 operators: docomo, jphone, and au.)

also, of the alternative payment methods, approximately what % of the 
transactions are made via credit card?

any pointers to sites with relevant stats would also be greatly appreciated.

thanks.


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