Their currently outdated Corona SDK plugin uses Vungle SDK 6.3, and I’ve also already received an email from Google about removal of my game from the app store if I don’t update the Vungle plugin within 30 days.
Vungle says that we need to upgrade to version 6.5 but we currently can’t do that without the release of a new plugin from them. I completely understand if we as developers are not a large enough market for them, and in that case I would hope they just open source the plugin then one of us can update it.