You can use PlaceholderAPI to get placeholders from DeluxeCoinflip. You do not need an external PlaceholderAPI expansion to use these.
%deluxecoinflip_games_played%- Total number of games played.
%deluxecoinflip_wins%- Number of games won.
%deluxecoinflip_losses%- Number of games lost.
%deluxecoinflip_win_percentage%- Win to loss ratio as percentage.
%deluxecoinflip_profit%- Total profit earned from wins.
%deluxecoinflip_profit_formatted%- Formatted total profit earned from wins (e.g. 3,000,000).