The non-commercial Advanced Sessions Plugin for Unreal Engine can be used to create Blueprint-only games with Epic Online Services. I have made a YouTube video explaining how to do this. Currently, this requires small patches of the plugin, which will hopefully be merged soon.

Click on the image to watch this video. Note that the link will navigate to

Epic Online Services with Blueprints

Epic, Epic Games, Unreal and Unreal Engine are trademarks or registered trademarks of Epic Games, Inc. in the United States of America and elsewhere.