One month after the release of iOS 8.0, Apple officially rolled out iOS 8.1 today with a major new feature: Apple Pay, the Touch ID-powered digital transaction software. As of now, Apple Pay is solely available for U.S. users of the iPhone 6 and iPhone 6 Plus, though it will also be supported — partially — by the iPad Air 2 and iPad mini 3 once they are released later this week. Here’s a look at the Apple Pay setup process, which is somewhat…