Optional
appidBadge ID. Currently, no official badge schema is available.
(Optional) Provided if the badge relates to an app (trading cards).
Optional
communityitemid(Optional) Provided if the badge relates to an app (trading cards); the value doesn't seem to be an item in the steam accounts backpack, however the value minus 1 seems to be the item ID for the emoticon granted for crafting this badge, and the value minus 2 seems to be the background granted.
Unix timestamp of when the steam user acquired the badge.
The amount of people who has this badge.
The experience this badge is worth, contributing toward the steam account's player_xp.
(Optional) Provided if the badge relates to an app (trading cards).