Deduct money

    //begin vault
    public Economy econ;
    //end vault

    public void onEnable() {
        //begin vault
        setupEconomy();
        //end vault
    }
    public boolean onCommand(CommandSender cs, Command cmd, String label, String[] args) {
        if(label.equalsIgnoreCase("yourcommand")) {
            if(cs.hasPermission("your.permission.node")) {
                //You can change the amout of money being deducted
                EconomyResponse er = econ.withdrawPlayer(cs.getName(), 1.0);
                if(er.transactionSuccess()) {
                    //The player has enough money and no errors occured
                    //Do your command here
                    return true;
                }
                else {
                    cs.sendMessage(ChatColor.RED + "Insufficent funds!");
                    return true;
                }
            }
            else {
                cs.sendMessage(ChatColor.RED + "You do not have permission!");
                return true;
            }
        }
        return false;
    }
    //Some parts of this code are copied from Vault. You will know by the code starting with "begin vault". At the end there should be a "end vault".
    //begin vault
    private boolean setupEconomy() {
        if (getServer().getPluginManager().getPlugin("Vault") == null) {
            return false;
        }
        RegisteredServiceProvider<Economy> rsp = getServer().getServicesManager().getRegistration(Economy.class);
        if (rsp == null) {
            return false;
        }
        econ = rsp.getProvider();
        return econ != null;
    }
    //end vault