As someone who lives in Tokyo, I beg to differ at this point in time. Last year, there were not many people holding iPhones on trains. Now, it's quite widespread.
I'm also interested in learning about Merchant Accounts. If anyone has time to talk about it, would be very appreciative. My contact is in my profile. Thanks!
Which payment processor did you end up using for dealing with credit cards and whatnot? What were the fees? Would appreciate any information you might have.