[Request] Refine item as Requirements

[AnimeRO 0]

i am making a shop npc that sells custom item

then the lets say requirements are +10 knife 100 apples 100 elunium and 1k zeny

but i am browsing the forum and i cant see any guide until i see the 2014 post but theres no answer 

how to make my dream npc posible sir?

 

i tryied browsing and searching for days i only see tcg shop and points shop but i want quest requirements would be a refine material