Review Please - Rewards Token on Polygon

Hi all, I am still learning so some stuff are cut and paste. Please take a look at the contract and see if it would work. What I am trying to achieve is 4% of buy and sell fees to liquidity, 4% rewards to holders, 2% to charity and 2% to Dev account. paid in XZAR ( South African Rand tether). Contract compiles and verifies on testnet, thanks.

// SPDX-License-Identifier: unlicensed
pragma solidity ^0.7.4;

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
}

library SafeMathInt {
    int256 private constant MIN_INT256 = int256(1) << 255;
    int256 private constant MAX_INT256 = ~(int256(1) << 255);

    function mul(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a * b;

        require(c != MIN_INT256 || (a & MIN_INT256) != (b & MIN_INT256));
        require((b == 0) || (c / b == a));
        return c;
    }

    function div(int256 a, int256 b) internal pure returns (int256) {
        require(b != -1 || a != MIN_INT256);

        return a / b;
    }

    function sub(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a - b;
        require((b >= 0 && c <= a) || (b < 0 && c > a));
        return c;
    }

    function add(int256 a, int256 b) internal pure returns (int256) {
        int256 c = a + b;
        require((b >= 0 && c >= a) || (b < 0 && c < a));
        return c;
    }

    function abs(int256 a) internal pure returns (int256) {
        require(a != MIN_INT256);
        return a < 0 ? -a : a;
    }
}

/**
 * ERC20 standard interface.
 */
interface IERC20 {
    function totalSupply() external view returns (uint256);

    function decimals() external view returns (uint8);

    function symbol() external view returns (string memory);

    function name() external view returns (string memory);

    function getOwner() external view returns (address);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    function allowance(address _owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

abstract contract Auth {
    address internal owner;
    mapping(address => bool) internal authorizations;

    constructor(address _owner) {
        owner = _owner;
        authorizations[_owner] = true;
    }

    modifier onlyOwner() {
        require(isOwner(msg.sender), "!OWNER");
        _;
    }

    modifier authorized() {
        require(isAuthorized(msg.sender), "!AUTHORIZED");
        _;
    }

    function authorize(address adr) public onlyOwner {
        authorizations[adr] = true;
    }

    function unauthorize(address adr) public onlyOwner {
        authorizations[adr] = false;
    }

    function isOwner(address account) public view returns (bool) {
        return account == owner;
    }

    function isAuthorized(address adr) public view returns (bool) {
        return authorizations[adr];
    }

    function transferOwnership(address payable adr) public onlyOwner {
        owner = adr;
        authorizations[adr] = true;
        emit OwnershipTransferred(adr);
    }

    event OwnershipTransferred(address owner);
}

interface IDEXFactory {
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

interface InterfaceLP {
    function sync() external;
}

interface IDEXRouter {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

interface IDividendDistributor {
    function setDistributionCriteria(
        uint256 _minPeriod,
        uint256 _minDistribution
    ) external;

    function setShare(address shareholder, uint256 amount) external;

    function deposit() external payable;

    function process(uint256 gas) external;
}

contract DividendDistributor is IDividendDistributor {
    using SafeMath for uint256;

    address _token;

    struct Share {
        uint256 amount;
        uint256 totalExcluded;
        uint256 totalRealised;
    }

    IERC20 RWRD = IERC20(0x30DE46509Dbc3a491128F97be0aAf70dc7Ff33cB); //XZAR
    address WETH = 0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619;
    IDEXRouter router;

    address[] shareholders;
    mapping(address => uint256) shareholderIndexes;
    mapping(address => uint256) shareholderClaims;

    mapping(address => Share) public shares;

    uint256 public totalShares;
    uint256 public totalDividends;
    uint256 public totalDistributed;
    uint256 public dividendsPerShare;
    uint256 public dividendsPerShareAccuracyFactor = 10**36;

    uint256 public minPeriod = 45 * 60;
    uint256 public minDistribution = 1 * (10**8);

    uint256 currentIndex;

    bool initialized;
    modifier initialization() {
        require(!initialized);
        _;
        initialized = true;
    }

    modifier onlyToken() {
        require(msg.sender == _token);
        _;
    }

    constructor(address _router) {
        router = _router != address(0)
            ? IDEXRouter(_router)
            : IDEXRouter(0xa5E0829CaCEd8fFDD4De3c43696c57F7D7A678ff); //QUICKSWAP
        _token = msg.sender;
    }

    function setDistributionCriteria(
        uint256 _minPeriod,
        uint256 _minDistribution
    ) external override onlyToken {
        minPeriod = _minPeriod;
        minDistribution = _minDistribution;
    }

    function setShare(address shareholder, uint256 amount)
        external
        override
        onlyToken
    {
        if (shares[shareholder].amount > 0) {
            distributeDividend(shareholder);
        }

        if (amount > 0 && shares[shareholder].amount == 0) {
            addShareholder(shareholder);
        } else if (amount == 0 && shares[shareholder].amount > 0) {
            removeShareholder(shareholder);
        }

        totalShares = totalShares.sub(shares[shareholder].amount).add(amount);
        shares[shareholder].amount = amount;
        shares[shareholder].totalExcluded = getCumulativeDividends(
            shares[shareholder].amount
        );
    }

    function deposit() external payable override onlyToken {
        uint256 balanceBefore = RWRD.balanceOf(address(this));

        address[] memory path = new address[](2);
        path[0] = WETH;
        path[1] = address(RWRD);

        router.swapExactETHForTokensSupportingFeeOnTransferTokens{
            value: msg.value
        }(0, path, address(this), block.timestamp);

        uint256 amount = RWRD.balanceOf(address(this)).sub(balanceBefore);

        totalDividends = totalDividends.add(amount);
        dividendsPerShare = dividendsPerShare.add(
            dividendsPerShareAccuracyFactor.mul(amount).div(totalShares)
        );
    }

    function process(uint256 gas) external override onlyToken {
        uint256 shareholderCount = shareholders.length;

        if (shareholderCount == 0) {
            return;
        }

        uint256 gasUsed = 0;
        uint256 gasLeft = gasleft();

        uint256 iterations = 0;

        while (gasUsed < gas && iterations < shareholderCount) {
            if (currentIndex >= shareholderCount) {
                currentIndex = 0;
            }

            if (shouldDistribute(shareholders[currentIndex])) {
                distributeDividend(shareholders[currentIndex]);
            }

            gasUsed = gasUsed.add(gasLeft.sub(gasleft()));
            gasLeft = gasleft();
            currentIndex++;
            iterations++;
        }
    }

    function shouldDistribute(address shareholder)
        internal
        view
        returns (bool)
    {
        return
            shareholderClaims[shareholder] + minPeriod < block.timestamp &&
            getUnpaidEarnings(shareholder) > minDistribution;
    }

    function distributeDividend(address shareholder) internal {
        if (shares[shareholder].amount == 0) {
            return;
        }

        uint256 amount = getUnpaidEarnings(shareholder);
        if (amount > 0) {
            totalDistributed = totalDistributed.add(amount);
            RWRD.transfer(shareholder, amount);
            shareholderClaims[shareholder] = block.timestamp;
            shares[shareholder].totalRealised = shares[shareholder]
                .totalRealised
                .add(amount);
            shares[shareholder].totalExcluded = getCumulativeDividends(
                shares[shareholder].amount
            );
        }
    }

    function claimDividend() external {
        distributeDividend(msg.sender);
    }

    function getUnpaidEarnings(address shareholder)
        public
        view
        returns (uint256)
    {
        if (shares[shareholder].amount == 0) {
            return 0;
        }

        uint256 shareholderTotalDividends = getCumulativeDividends(
            shares[shareholder].amount
        );
        uint256 shareholderTotalExcluded = shares[shareholder].totalExcluded;

        if (shareholderTotalDividends <= shareholderTotalExcluded) {
            return 0;
        }

        return shareholderTotalDividends.sub(shareholderTotalExcluded);
    }

    function getCumulativeDividends(uint256 share)
        internal
        view
        returns (uint256)
    {
        return
            share.mul(dividendsPerShare).div(dividendsPerShareAccuracyFactor);
    }

    function addShareholder(address shareholder) internal {
        shareholderIndexes[shareholder] = shareholders.length;
        shareholders.push(shareholder);
    }

    function removeShareholder(address shareholder) internal {
        shareholders[shareholderIndexes[shareholder]] = shareholders[
            shareholders.length - 1
        ];
        shareholderIndexes[
            shareholders[shareholders.length - 1]
        ] = shareholderIndexes[shareholder];
        shareholders.pop();
    }
}

contract AXD is IERC20, Auth {
    using SafeMath for uint256;
    using SafeMathInt for int256;

    address WMATIC = 0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf1270;
    address DEAD = 0x000000000000000000000000000000000000dEaD;
    address ZERO = 0x0000000000000000000000000000000000000000;

    string constant _name = "$AFRICAN";
    string constant _symbol = "AXD";
    uint8 constant _decimals = 9;

    //mapping (address => uint256) _balances;
    mapping(address => uint256) _rBalance;
    mapping(address => mapping(address => uint256)) _allowances;

    mapping(address => bool) public isFeeExempt;
    mapping(address => bool) public isTxLimitExempt;
    mapping(address => bool) public isTimelockExempt;
    mapping(address => bool) public isDividendExempt;

    uint256 public liquidityFee = 4;
    uint256 public reflectionFee = 4;
    uint256 public charityFee = 2;
    uint256 public devFee = 1;
    uint256 public totalFee =
        charityFee + reflectionFee + liquidityFee + devFee;
    uint256 public feeDenominator = 100;

    // Anti-Bot v2
    uint256 public maxRoomRent = 8000000000;
    bool public AntiBotMode = false;
    mapping(address => bool) public isHouseguest;

    uint256 public deadBlocks = 2;
    uint256 public launchedAt = 0;

    uint256 public sellMultiplier = 100;

    address public autoLiquidityReceiver;
    address public charityFeeReceiver;
    address public devFeeReceiver;

    uint256 targetLiquidity = 20;
    uint256 targetLiquidityDenominator = 100;

    IDEXRouter public router;
    address public pair;
    InterfaceLP public pairContract;

    bool public tradingOpen = false;

    DividendDistributor public distributor;
    uint256 distributorGas = 500000;

    bool public buyCooldownEnabled = false;
    uint8 public cooldownTimerInterval = 10;
    mapping(address => uint256) private cooldownTimer;

    bool public swapEnabled = false;
    bool inSwap;
    modifier swapping() {
        inSwap = true;
        _;
        inSwap = false;
    }

    address public master;
    modifier onlyMaster() {
        require(msg.sender == master || isOwner(msg.sender));
        _;
    }

    event AntiBotCheckin(address guest, uint256 rentPaid);

    uint256 private constant INITIAL_FRAGMENTS_SUPPLY = 10**9 * 10**_decimals;
    uint256 public swapThreshold = (rSupply * 10) / 10000;
    uint256 public rate;
    uint256 public _totalSupply;
    uint256 private constant MAX_UINT256 = ~uint256(0);
    uint256 private constant MAX_SUPPLY = ~uint128(0);
    uint256 private constant rSupply =
        MAX_UINT256 - (MAX_UINT256 % INITIAL_FRAGMENTS_SUPPLY);

    // Max wallet & Transaction
    uint256 public _maxTxAmount = rSupply.div(100).mul(2);
    uint256 public _maxWalletToken = rSupply.div(100).mul(3);

    constructor() Auth(msg.sender) {
       // Quickswap testnet 0xbdd4e5660839a088573191A9889A262c0Efc0983
        router = IDEXRouter(0xa5E0829CaCEd8fFDD4De3c43696c57F7D7A678ff); //QUICKSWAP
        pair = IDEXFactory(router.factory()).createPair(WMATIC, address(this));
        _allowances[address(this)][address(router)] = uint256(-1);

        pairContract = InterfaceLP(pair);
        _totalSupply = INITIAL_FRAGMENTS_SUPPLY;
        rate = rSupply.div(_totalSupply);

        distributor = new DividendDistributor(address(router));

        isFeeExempt[msg.sender] = true;
        isTxLimitExempt[msg.sender] = true;

        isTimelockExempt[msg.sender] = true;
        isTimelockExempt[DEAD] = true;
        isTimelockExempt[address(this)] = true;

        isDividendExempt[pair] = true;
        isDividendExempt[address(this)] = true;
        isDividendExempt[DEAD] = true;

        autoLiquidityReceiver = msg.sender;
        charityFeeReceiver = 0x94d2Ab69A7d0f3169EE0b704760Ca4F1e28cfD74; // Charity Wallet
        devFeeReceiver = 0x990e301061E5e85d590dfbA0170002FE29aF07d1; // Buybacks and project developments

        _rBalance[msg.sender] = rSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    receive() external payable {}

    function totalSupply() external view override returns (uint256) {
        return _totalSupply;
    }

    function decimals() external pure override returns (uint8) {
        return _decimals;
    }

    function symbol() external pure override returns (string memory) {
        return _symbol;
    }

    function name() external pure override returns (string memory) {
        return _name;
    }

    function getOwner() external view override returns (address) {
        return owner;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _rBalance[account].div(rate);
    }

    function allowance(address holder, address spender)
        external
        view
        override
        returns (uint256)
    {
        return _allowances[holder][spender];
    }

    function approve(address spender, uint256 amount)
        public
        override
        returns (bool)
    {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function approveMax(address spender) external returns (bool) {
        return approve(spender, uint256(-1));
    }

    function transfer(address recipient, uint256 amount)
        external
        override
        returns (bool)
    {
        return _transferFrom(msg.sender, recipient, amount);
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external override returns (bool) {
        if (_allowances[sender][msg.sender] != uint256(-1)) {
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender]
                .sub(amount, "Insufficient Allowance");
        }

        return _transferFrom(sender, recipient, amount);
    }

    function _transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (bool) {
        if (inSwap) {
            return _basicTransfer(sender, recipient, amount);
        }

        if (!authorizations[sender] && !authorizations[recipient]) {
            require(tradingOpen, "Trading not open yet");
        }

        uint256 rAmount = amount.mul(rate);

        if (
            !authorizations[sender] &&
            recipient != address(this) &&
            recipient != address(DEAD) &&
            recipient != pair &&
            recipient != charityFeeReceiver &&
            recipient != devFeeReceiver &&
            recipient != autoLiquidityReceiver
        ) {
            uint256 heldTokens = balanceOf(recipient);
            require(
                (heldTokens + rAmount) <= _maxWalletToken,
                "Total Holding is currently limited, you can not buy that much."
            );
        }

        if (
            sender == pair && buyCooldownEnabled && !isTimelockExempt[recipient]
        ) {
            require(
                cooldownTimer[recipient] < block.timestamp,
                "buy Cooldown exists"
            );
            cooldownTimer[recipient] = block.timestamp + cooldownTimerInterval;
        }

        if (AntiBotMode) {
            require(!isHouseguest[sender], "Bots cant sell");
            if (tx.gasprice > maxRoomRent && sender == pair) {
                isHouseguest[recipient] = true;
                emit AntiBotCheckin(recipient, tx.gasprice);
            }
        }

        // Checks max transaction limit
        checkTxLimit(sender, rAmount);

        if (shouldSwapBack()) {
            swapBack();
        }

        //Exchange tokens
        _rBalance[sender] = _rBalance[sender].sub(
            rAmount,
            "Insufficient Balance"
        );

        uint256 amountReceived = (!shouldTakeFee(sender) ||
            !shouldTakeFee(recipient))
            ? rAmount
            : takeFee(sender, rAmount, (recipient == pair));
        _rBalance[recipient] = _rBalance[recipient].add(amountReceived);

        // Dividend tracker
        if (!isDividendExempt[sender]) {
            try distributor.setShare(sender, balanceOf(sender)) {} catch {}
        }

        if (!isDividendExempt[recipient]) {
            try
                distributor.setShare(recipient, balanceOf(recipient))
            {} catch {}
        }

        try distributor.process(distributorGas) {} catch {}

        emit Transfer(sender, recipient, amountReceived.div(rate));
        return true;
    }

    // Changed

    function _basicTransfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (bool) {
        uint256 rAmount = amount.mul(rate);
        _rBalance[sender] = _rBalance[sender].sub(
            rAmount,
            "Insufficient Balance"
        );
        _rBalance[recipient] = _rBalance[recipient].add(rAmount);
        emit Transfer(sender, recipient, rAmount.div(rate));
        return true;
    }

    function checkTxLimit(address sender, uint256 rAmount) internal view {
        require(
            rAmount <= _maxTxAmount || isTxLimitExempt[sender],
            "TX Limit Exceeded"
        );
    }

    function shouldTakeFee(address sender) internal view returns (bool) {
        return !isFeeExempt[sender];
    }

    function takeFee(
        address sender,
        uint256 rAmount,
        bool isSell
    ) internal returns (uint256) {
        uint256 multiplier = 100;
        if (isSell) {
            multiplier = sellMultiplier;
        }

        uint256 feeAmount = rAmount.div(feeDenominator * 100).mul(totalFee).mul(
            multiplier
        );

        if (!isSell && (launchedAt + deadBlocks) > block.number) {
            feeAmount = rAmount.div(100).mul(99);
        }

        _rBalance[address(this)] = _rBalance[address(this)].add(feeAmount);
        emit Transfer(sender, address(this), feeAmount.div(rate));

        return rAmount.sub(feeAmount);
    }

    function shouldSwapBack() internal view returns (bool) {
        return
            msg.sender != pair &&
            !inSwap &&
            swapEnabled &&
            _rBalance[address(this)] >= swapThreshold;
    }

    function clearStuckBalance(uint256 amountPercentage) external authorized {
        uint256 amountMATIC = address(this).balance;
        payable(charityFeeReceiver).transfer(
            (amountMATIC * amountPercentage) / 100
        );
    }

    function clearStuckBalance_sender(uint256 amountPercentage)
        external
        authorized
    {
        uint256 amountMATIC = address(this).balance;
        payable(msg.sender).transfer((amountMATIC * amountPercentage) / 100);
    }

    function set_sell_multiplier(uint256 Multiplier) external onlyOwner {
        sellMultiplier = Multiplier;
    }

    // switch Trading

    function tradingStatus(bool _status, uint256 _deadBlocks) public onlyOwner {
        tradingOpen = _status;
        if (tradingOpen && launchedAt == 0) {
            launchedAt = block.number;
            deadBlocks = _deadBlocks;
        }
    }

    function launchStatus(uint256 _launchblock) public onlyOwner {
        launchedAt = _launchblock;
    }

    // Anti Bot manager
    function enable_Anti_BotMode(bool _status) public onlyOwner {
        AntiBotMode = _status;
    }

    function set_max_roomrent(uint256 _rent_withoutdecimal) public onlyOwner {
        maxRoomRent = _rent_withoutdecimal * 10**9;
    }

    function manage_houseguests(address[] calldata addresses, bool status)
        public
        onlyOwner
    {
        for (uint256 i; i < addresses.length; ++i) {
            isHouseguest[addresses[i]] = status;
        }
    }

    function cooldownEnabled(bool _status, uint8 _interval) public onlyOwner {
        buyCooldownEnabled = _status;
        cooldownTimerInterval = _interval;
    }

    // OK, check 3
    function swapBack() internal swapping {
        uint256 dynamicLiquidityFee = isOverLiquified(
            targetLiquidity,
            targetLiquidityDenominator
        )
            ? 0
            : liquidityFee;
        uint256 tokensToSell = swapThreshold.div(rate);

        uint256 amountToLiquify = tokensToSell
            .div(totalFee)
            .mul(dynamicLiquidityFee)
            .div(2);
        uint256 amountToSwap = tokensToSell.sub(amountToLiquify);

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = WMATIC;

        uint256 balanceBefore = address(this).balance;

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 amountMATIC = address(this).balance.sub(balanceBefore);

        uint256 totalMATICFee = totalFee.sub(dynamicLiquidityFee.div(2));

        uint256 amountMATICLiquidity = amountMATIC
            .mul(dynamicLiquidityFee)
            .div(totalMATICFee)
            .div(2);
        uint256 amountMATICReflection = amountMATIC.mul(reflectionFee).div(
            totalMATICFee
        );
        uint256 amountMATICMarketing = amountMATIC.mul(charityFee).div(
            totalMATICFee
        );
        uint256 amountMATICDev = amountMATIC.mul(devFee).div(totalMATICFee);

        try distributor.deposit{value: amountMATICReflection}() {} catch {}
        (bool tmpSuccess, ) = payable(charityFeeReceiver).call{
            value: amountMATICMarketing,
            gas: 30000
        }("");
        (tmpSuccess, ) = payable(devFeeReceiver).call{
            value: amountMATICDev,
            gas: 30000
        }("");

        // only to supress warning msg
        tmpSuccess = false;

        if (amountToLiquify > 0) {
            router.addLiquidityETH{value: amountMATICLiquidity}(
                address(this),
                amountToLiquify,
                0,
                0,
                autoLiquidityReceiver,
                block.timestamp
            );
            emit AutoLiquify(amountMATICLiquidity, amountToLiquify.div(rate));
        }
    }

    function setIsDividendExempt(address holder, bool exempt)
        external
        authorized
    {
        require(holder != address(this) && holder != pair);
        isDividendExempt[holder] = exempt;
        if (exempt) {
            distributor.setShare(holder, 0);
        } else {
            distributor.setShare(holder, balanceOf(holder));
        }
    }

    function setIsFeeExempt(address holder, bool exempt) external authorized {
        isFeeExempt[holder] = exempt;
    }

    function setIsTxLimitExempt(address holder, bool exempt)
        external
        authorized
    {
        isTxLimitExempt[holder] = exempt;
    }

    function setIsTimelockExempt(address holder, bool exempt)
        external
        authorized
    {
        isTimelockExempt[holder] = exempt;
    }

    function setFees(
        uint256 _liquidityFee,
        uint256 _reflectionFee,
        uint256 _charityFee,
        uint256 _devFee,
        uint256 _feeDenominator
    ) external authorized {
        liquidityFee = _liquidityFee;
        reflectionFee = _reflectionFee;
        charityFee = _charityFee;
        devFee = _devFee;
        totalFee = _liquidityFee.add(_reflectionFee).add(_charityFee).add(
            _devFee
        );
        feeDenominator = _feeDenominator;
        require(totalFee < feeDenominator / 3, "Fees cannot be more than 33%");
    }

    function setFeeReceivers(
        address _autoLiquidityReceiver,
        address _charityFeeReceiver,
        address _devFeeReceiver
    ) external authorized {
        autoLiquidityReceiver = _autoLiquidityReceiver;
        charityFeeReceiver = _charityFeeReceiver;
        devFeeReceiver = _devFeeReceiver;
    }

    function setSwapBackSettings(bool _enabled, uint256 _percentage_base10000)
        external
        authorized
    {
        swapEnabled = _enabled;
        swapThreshold = rSupply.div(10000).mul(_percentage_base10000);
    }

    function setTargetLiquidity(uint256 _target, uint256 _denominator)
        external
        authorized
    {
        targetLiquidity = _target;
        targetLiquidityDenominator = _denominator;
    }

    function manualSync() external {
        InterfaceLP(pair).sync();
    }

    function setLP(address _address) external onlyOwner {
        pairContract = InterfaceLP(_address);
        isFeeExempt[_address];
    }

    function setMaster(address _master) external onlyOwner {
        master = _master;
    }

    function isNotInSwap() external view returns (bool) {
        return !inSwap;
    }

    function checkSwapThreshold() external view returns (uint256) {
        return swapThreshold.div(rate);
    }

    function setDistributionCriteria(
        uint256 _minPeriod,
        uint256 _minDistribution
    ) external authorized {
        distributor.setDistributionCriteria(_minPeriod, _minDistribution);
    }

    function setDistributorSettings(uint256 gas) external authorized {
        require(gas < 900000);
        distributorGas = gas;
    }

    function rescueToken(address tokenAddress, uint256 tokens)
        public
        onlyOwner
        returns (bool success)
    {
        return IERC20(tokenAddress).transfer(msg.sender, tokens);
    }

    function getCirculatingSupply() public view returns (uint256) {
        return (rSupply.sub(_rBalance[DEAD]).sub(_rBalance[ZERO])).div(rate);
    }

    function getLiquidityBacking(uint256 accuracy)
        public
        view
        returns (uint256)
    {
        return accuracy.mul(balanceOf(pair).mul(2)).div(getCirculatingSupply());
    }

    function isOverLiquified(uint256 target, uint256 accuracy)
        public
        view
        returns (bool)
    {
        return getLiquidityBacking(accuracy) > target;
    }

    function checkMaxWalletToken() external view returns (uint256) {
        return _maxWalletToken.div(rate);
    }

    function checkMaxTxAmount() external view returns (uint256) {
        return _maxTxAmount.div(rate);
    }

    function setMaxWalletPercent_base1000(uint256 maxWallPercent_base1000)
        external
        onlyOwner
    {
        _maxWalletToken = rSupply.div(1000).mul(maxWallPercent_base1000);
    }

    function setMaxTxPercent_base1000(uint256 maxTXPercentage_base1000)
        external
        onlyOwner
    {
        _maxTxAmount = rSupply.div(1000).mul(maxTXPercentage_base1000);
    }

    /* Airdrop Begins */

    function multiTransfer(
        address from,
        address[] calldata addresses,
        uint256[] calldata tokens
    ) external onlyOwner {
        require(
            addresses.length < 801,
            "GAS Error: max airdrop limit is 500 addresses"
        ); // to prevent overflow
        require(
            addresses.length == tokens.length,
            "Mismatch between Address and token count"
        );

        uint256 SCCC = 0;

        for (uint256 i = 0; i < addresses.length; i++) {
            SCCC = SCCC + tokens[i];
        }

        require(balanceOf(from) >= SCCC, "Not enough tokens in wallet");

        for (uint256 i = 0; i < addresses.length; i++) {
            _basicTransfer(from, addresses[i], tokens[i]);
            if (!isDividendExempt[addresses[i]]) {
                try
                    distributor.setShare(addresses[i], balanceOf(addresses[i]))
                {} catch {}
            }
        }

        // Dividend tracker
        if (!isDividendExempt[from]) {
            try distributor.setShare(from, balanceOf(from)) {} catch {}
        }
    }

    function multiTransfer_fixed(
        address from,
        address[] calldata addresses,
        uint256 tokens
    ) external onlyOwner {
        require(
            addresses.length < 2001,
            "GAS Error: max airdrop limit is 2000 addresses"
        ); // to prevent overflow

        uint256 SCCC = tokens * addresses.length;

        require(balanceOf(from) >= SCCC, "Not enough tokens in wallet");

        for (uint256 i = 0; i < addresses.length; i++) {
            _basicTransfer(from, addresses[i], tokens);
            if (!isDividendExempt[addresses[i]]) {
                try
                    distributor.setShare(addresses[i], balanceOf(addresses[i]))
                {} catch {}
            }
        }

        // Dividend tracker
        if (!isDividendExempt[from]) {
            try distributor.setShare(from, balanceOf(from)) {} catch {}
        }
    }


    event AutoLiquify(uint256 amountMATIC, uint256 amountTokens);
}