Multiplayer with SmartFox Server 2X

Anyone here tried to link SmartFox Server 2X into Unreal Engine? They have a C++ API which, in theory, can be used into UE code projects, but I don’t know if this requires change the source code or can be made only with new classes in project. Also, can it be possible to be used in mobile? If anyone know something about it, I’ll be glad to know.