The hash identifier for the item in question. Use it to look up the item's DestinyInventoryItemDefinition.
Mapped to DestinyInventoryItemDefinition in the manifest.
If this quantity is referring to a specific instance of an item, this will have the item's instance ID. Normally, this will be null.
The amount of the item needed/available depending on the context of where DestinyItemQuantity is being used.
The quest reward item may be associated with a vendor. If so, this is that vendor. Use this hash to look up the DestinyVendorDefinition.
Mapped to DestinyVendorDefinition in the manifest.
The quest reward item may be associated with a vendor. If so, this is the index of the item being sold, which we can use at runtime to find instanced item information for the reward item.
A subclass of DestinyItemQuantity, that provides not just the item and its quantity but also information that BNet can - at some point - use internally to provide more robust runtime information about the item's qualities.
If you want it, please ask! We're just out of time to wire it up right now. Or a clever person just may do it with our existing endpoints.