Apple is expected to continue its September tradition of the past few years by unveiling the iPhone 6 and a smart watch on Tuesday. The devices reportedly will add mobile payments to compete with companies like Amazon and Square that are using the new technology. The iPhone 6 and smart watch will use near field communication technology to allow users to buy things by scanning their devices on sensors in certain stores like the Apple retail shops, coupled with tokenization that generates a one-time use payment code, according to industry blog Bank Innovation. This combination may boost convenience and decrease fraud, but linking payments with mobile phones also raises privacy concerns. Apple’s addition of a fingerprint scanner to its iPhone 5S last September sparked concern about granting the tech giant greater access to users’ personal information. The iPhone 6 also will have a larger display to meet growing consumer demand for bigger screen size and an easier b