Add a method where you can use the player’s balance

[JavierLeon9966]

Currently there is no way to make Player A pay Player B depending on its balance (ex: a percentage of Player A) without causing a race condition. I would suggest having some parameter where it accepts a promise and that in the first argument it has the player A balance. Example:

$promise = function(int $balance) use($percentage){
    return $balance * $percentage / 100;
};
yield from $capital->payWithBalance(
    "SellHeads",
    $player1,
    $player2,
    $this->selector,
    $promise, //This could also be async just like `Capital::api()`
    new LabelSet(["reason" => "Claimed head"])
);

[SOF3]

this can also be used for setBalance. Neat solution without making it easy to abuse like getMoney does.