Steam DLC

I am making an FPS game single player and multiplayer. I use mainly blueprints and no C++. I am wondering if there is a good tutorial on integrating a DLC through steam. Even if it’s something simple like everyone has the content added to their game but only some see it based on booleans. Such as “boolean true” after they bought the dlc enables a new map to be chosen from the list. I know how to make the game side of it to unhide based on booleans but I don’t know how to link it to steam and a purchase. Thanks for any help given.

Just an fyi, I would probably pay for a complete tutorial of this. It would help on all future projects.