Dominion.PlayerState.AddCoins C# (CSharp) Method

        internal void AddCoins(int coinAmount)
        {
            this.turnCounters.AddCoins(this, coinAmount);
        }

 public override void DoSpecializedAction(PlayerState currentPlayer, GameState gameState)
 {
     if (currentPlayer.RequestPlayerDiscardCardFromHand(gameState, acceptableCard => acceptableCard == Estate.card, isOptional: true))
     {
         currentPlayer.AddCoins(4);
     }
     else
     {
         currentPlayer.GainCardFromSupply(Estate.card, gameState);
     }
 }