https://techcrunch.com/2017/12/02/apple-releases-ios-112-with-it-autocorrect-fix-faster-wireless-charging-and-apple-pay-cash/

Apple released an iOS update in the middle of the night (Cupertino time). iOS 11.2 brings Apple Pay Cash, but the feature is not live yet. The company still needs to flip a switch on its servers to enable it.

Today’s update also enables support for faster 7.5W Qi wireless charging. If you have an iPhone 8 or an iPhone X as well as a wireless charger that supports 7.5W or more, your phone will now charge more quickly as Apple first limited wireless charging to 5W.