After handling a SteamInventoryEligiblePromoItemDefIDs_t call result, use this
function to pull out the list of item definition ids that the user can be
manually granted via the AddPromoItems() call.
public static bool GetEligiblePromoItemDefinitionIDs(CSteamID steamID, SteamItemDef_t[] pItemDefIDs, ref uint punItemDefIDsArraySize) { InteropHelp.TestIfAvailableGameServer(); return NativeMethods.ISteamGameServerInventory_GetEligiblePromoItemDefinitionIDs(steamID, pItemDefIDs, ref punItemDefIDsArraySize); } }