This plugin uses the touch Id found in iOS 8+ and iphone 5s(and above). Also supports Face id with iphone X (and above) with a NSFaceIDUsageDescription see build.setting for info
Limitations:Only works on iOS and "not" iOS simulator
touchId.show(listener, reason, fallbackTitle, cancelTitle)
--listener (Required)(function) this will return event.response. Responses are "success", "failed", "enter password",and "Does not support touch id"
--reason (Required)(string) this text will show up inside the pop and is used to explain why touch id is needed.
--fallbackTitle (Optional)(string) Text to appear when biometric auth failed and to use another method, will trigger "enter password" for listener.
--cancelTitle (Optional)(string) Text to appear when biometric auth failed and to Cancel, will trigger "failed" for listener.