If the Milestone or a component has vendors whose inventories could/should be displayed that are relevant to it, this will return the vendor in question.

It also contains information we need to determine whether that vendor is actually relevant at the moment, given the user's current state.
Type: object
Object Properties
Mapped to Definition
The hash of the vendor whose wares should be shown as associated with the Milestone.
Type: uint32
Mapped to Manifest Database Definition: Destiny.Definitions.DestinyVendorDefinition