You can view their list of apis here https://developer.mastercard.com/portal/display/api/API but they do require you to go through some exercises before you can get to some of them. With the PayPass program i'm not sure on the specifics but I would assume a fairly strenuous look at your business and what you intend to do.

Ok, found the guy behind it: https://twitter.com/tobyai And about the integration with Mastercard: https://www.cryptocoinsnews.com/onebit-app-enable-bitcoin-wh...