Back end services with Epic Store?

If you were to launch a multiplayer FPS game via Epic Store, what are options for back end services? (Player login, Achievements, Matchmaking etc.)

Do we need to create our own or can we use 3rd party services like GameSparks? And what are the best 3rd party services?

In December, Epic announced they will be launching their “Epic Online Services,” including a roadmap of what features are expected to be added and when.

I’ve been working on an UE4 Plugin for EOS, which you can get from github or see the forum for more active details.