A milestone may have one or more active vendors that are "related" to it (that
provide rewards, or that are the initiators of the Milestone). I already regret
this, even as I'm typing it.
I told you I'd regret this You see, sometimes a
milestone may be directly correlated with a set of vendors that provide varying
tiers of rewards. The player may not be able to interact with one or more of
those vendors. This will return the hashes of the Vendors that the player can
interact with, allowing you to show their current inventory as rewards or
related items to the Milestone or its activities.
Before we even use it, it's already deprecated! How much of a bummer is that? We need more data.
Mapped to DestinyVendorDefinition in the manifest.