Applifier Impact/Everyplay GameAds are now being fully transformed into Unity Ads SDK! Yes, this time SDK API internals and documentation will be around for long term usage.
For iOS Obj-C and Android Java developers, a backwards compatibility API layer exists for easy transition path.
Unity users are provided with automated legacy cleanup scripts while importing the package, with some minor manual migration expected to re-configure new prefab and update API usage.
An updated documentation with migration guide is available at https://github.com/Applifier/unity-ads/wiki