NPC Buys Items from Player

Hi all. I am a new UE4 user following some online classes to get to grips with features etc.
I have a project I am working on that requires NPC characters to buy items from the player. Are there blueprints for stuff like this?
I keep searching but see players buying from other players or NPCs - I need to do it the other way around. Not multiplayer, needs to work single player.
Any help here would be amazing as my project is built on this feature.