Get the push notification token - iOS 10, Swift 3

Question

How to get the device token from new xCode 8, Swift 3 in iOS 10?

Here is the code to register notification:

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Answer 1

Code from Mixpanel library

    let tokenChars = (deviceToken as NSData).bytes.assumingMemoryBound(to: CChar.self)
    var tokenString = ""
    for i in 0..