MasterCard has been in the cashless payment game for quite a while, and now it's hoping to get more developers on the PayPass bandwagon with its freshly unveiled user interface software development kit. By leveraging the SDK, programmers will be able to bake the firm's NFC payment system, which is compatible with over 70 handsets, into their own Android or BlackBerry OS 7 apps. The kit is free to license and includes API code libraries, documentation, a developer guide, sample code, a white-label reference application and a testing suite. Once apps are created with the SDK, they'll have to go through MasterCard's approval process before they go live. Yearning to code PayPass-enabled smartphone software? Check out the press release below for more details.