Apple has invited third-party developers to its headquarters in Cupertino, California to allow them to test and finalize apps for the Apple Watch, according to 9to5Mac. The report claims that developers have been arriving at One Infinite Loop this month to work with Apple engineers on finishing WatchKit-based apps in categories such as sports, productivity and finance."The developers invited by Apple to Cupertino range from those behind titles for sports applications and productivity software. Apple has also been meeting with banks to work on WatchKit applications that assist with the Apple Watch’s Apple Pay functionality. Besides U.S.-based banks, Apple has been working on WatchKit apps with developers from Germany-based banks, which indicates Apple is likely in talks with more foreign banks to expand Apple Pay to more countries across the world."MacRumors reported a few weeks ago that some developers have been asked to have Apple Watch apps readied by this month, although this report claims that Apple