Apple recently released the new iOS 11.2 software update which brought Apple Pay Cash To the iPhone. Apple has now released their new watchOS 4.2 software update for the Apple Watch.
The Apple watchOS 4.2 software update brings a range of new features to the Apple Watch. This includes support for the new Apple Pay Cash on the device. Apple Pay Cash in only available in the US at the moment, Apple is expected to release it in more countries soon.
You can install the new watchOS 4.2 software update on your device with the Apple Watch App on the iPhone. This can be done by going to General > Software update. You Apple Watch will need to have at least 50% battery left to install the update.
The update also comes with some other new features and it is now available to install on all versions of the Apple Watch.