Editing a MaterialInstanceDynamic

Hi guys. My English isn’t very good, so I apologize in advance.
I’m working on a device that mimics a vending machine but is able to accept other items as “payment”.

I want to be able to edit a device property and have it reflect on the mesh. The properties on the MaterialInstance that I want to edit are Scalar Parameter Values and Texture Parameter Values. I’ve tried looking in the Verse documentation but it seems like no such API is exposed.