hero_player_id

The unique identifier of the player.

hero_player_id

The Id of the player (from the list of players in the player list) that is the hero.
Type: integer
Nullable: true
If this is an observed hand then hero_player_id can either be omitted or set to null.
Example:
"hero_player_id": 2
No hero player in the hand.
"hero_player_id": null