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Image copyrights and trademarks belong exclusively to Apple. #What is Touch ID? Simply put, Touch ID is Apple’s fingerprint technology for iOS mobile devices. It allows consumers to unlock their phones and make purchases conveniently using their fingerprint(s). Furthermore, as of iOS version 8.0, Apple opened Touch ID up to developers by making APIs available for use in the SDK. ###Biometric opinions This post assumes you have performed your own risk assessment and are aware of the risks associated with biometric authentication technologies, and that you have decided that Touch ID is suitable for use in your application. »