Hi @Forcevisual!
I couldn’t find much info about it but it looks like what you want is to retrieve the actor OnHit of the line tracing and when the player presses the input it opens a new “trading” widget between the player and the actor hit on.
UWorld::LineTraceSingleByChannel you get a FHitResult
FHitResult, a method that could prove useful is FHitResult.GetActor()