# Smart contract compiled on Remix, wont compile on Polygonscan

**URL:** <https://forum.openzeppelin.com/t/smart-contract-compiled-on-remix-wont-compile-on-polygonscan/12188>\
**Category:** Contracts\
**Tags:** erc20, etherscan-verify\
**Created:** [July 9, 2021, 4:01pm UTC](https://forum.openzeppelin.com/t/smart-contract-compiled-on-remix-wont-compile-on-polygonscan/12188 "2021-07-09T16:01:40Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![Josiah\_Price](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/josiah_price/32/5265_2.png) [@Josiah\_Price](https://forum.openzeppelin.com/u/Josiah_Price)\
**Post date:** [July 9, 2021, 4:01pm UTC](https://forum.openzeppelin.com/t/smart-contract-compiled-on-remix-wont-compile-on-polygonscan/12188/1 "2021-07-09T16:01:41Z")

</div>

Hello! I am seeking some help with verification of my smart contract. I have compiled in remix with no issues but when I go to verify in polygonscan I am faced with the following issue:

 ![image](https://us1.discourse-cdn.com/flex022/uploads/zeppelin/original/2X/f/f853fa77d702b5db84c2a2e08495bba0b74785ea.png)

 ![image](https://us1.discourse-cdn.com/flex022/uploads/zeppelin/original/2X/6/64e023353d3ceb53ab47b10af6f97418d1b386f3.png)

 ![image](https://us1.discourse-cdn.com/flex022/uploads/zeppelin/original/2X/4/450410181f7b91b7f8cbb67b897f698cb76e80b7.png)

I am not sure what to do.

> **[PolyEarn (PolyEarn) Token Tracker | PolygonScan](https://polygonscan.com/token/0xb2ea4c5cd05b76ff33fa6bb9b7ff61287f08e7a5)**
>
> PolyEarn (PolyEarn) Token Tracker on PolygonScan shows the price of the Token $0.0000, total supply 1,000,000,000, number of holders 22 and updated information of the token. The token tracker page also shows the analytics and historical data.

```
/**
 
*/

/*
    PolyEarn
    SPDX-License-Identifier: MIT
*/
pragma solidity ^0.6.12;
interface IERC20 {
    function totalSupply() external view returns (uint256);
    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);
}
interface IERC20Metadata is IERC20 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
}
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        this;
        return msg.data;
    }
}
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;
    }
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}
contract ERC20 is Context, IERC20, IERC20Metadata {
    using SafeMath for uint256;
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    constructor(string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
    }
    function name() public view virtual override returns (string memory) {
        return _name;
    }
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        _beforeTokenTransfer(sender, recipient, amount);
        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address(0), account, amount);
        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");
        _beforeTokenTransfer(account, address(0), amount);
        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}
library SafeMathUint {
    function toInt256Safe(uint256 a) internal pure returns (int256) {
        int256 b = int256(a);
        require(b >= 0);
        return b;
    }
}
library SafeMathInt {
    int256 private constant MIN_INT256 = int256(1) << 255;
    int256 private constant MAX_INT256 = ~(int256(1) <= 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;
    }
    function toUint256Safe(int256 a) internal pure returns (uint256) {
        require(a >= 0);
        return uint256(a);
    }
}
interface DividendPayingTokenInterface {
    function dividendOf(address _owner) external view returns(uint256);
    function distributeDividends() external payable;
    function withdrawDividend() external;
    event DividendsDistributed(
        address indexed from,
        uint256 weiAmount
    );
    event DividendWithdrawn(
        address indexed to,
        uint256 weiAmount
    );
}
interface DividendPayingTokenOptionalInterface {
    function withdrawableDividendOf(address _owner) external view returns(uint256);
    function withdrawnDividendOf(address _owner) external view returns(uint256);
    function accumulativeDividendOf(address _owner) external view returns(uint256);
}
contract DividendPayingToken is ERC20, DividendPayingTokenInterface, DividendPayingTokenOptionalInterface {
    using SafeMath for uint256;
    using SafeMathUint for uint256;
    using SafeMathInt for int256;
    uint256 constant internal magnitude = 2**128;
    uint256 internal magnifiedDividendPerShare;
    mapping(address => int256) internal magnifiedDividendCorrections;
    mapping(address => uint256) internal withdrawnDividends;
    uint256 public totalDividendsDistributed;
    constructor(string memory _name, string memory _symbol) public ERC20(_name, _symbol) {}
    receive() external payable {
        distributeDividends();
    }
    function distributeDividends() public override payable {
        require(totalSupply() > 0);
        if (msg.value > 0) {
            magnifiedDividendPerShare = magnifiedDividendPerShare.add(
                (msg.value).mul(magnitude) / totalSupply()
            );
            emit DividendsDistributed(msg.sender, msg.value);
            totalDividendsDistributed = totalDividendsDistributed.add(msg.value);
        }
    }
    function withdrawDividend() public virtual override {
        _withdrawDividendOfUser(msg.sender);
    }
    function _withdrawDividendOfUser(address payable user) internal returns (uint256) {
        uint256 _withdrawableDividend = withdrawableDividendOf(user);
        if (_withdrawableDividend > 0) {
            withdrawnDividends[user] = withdrawnDividends[user].add(_withdrawableDividend);
            emit DividendWithdrawn(user, _withdrawableDividend);
            (bool success,) = user.call{value: _withdrawableDividend, gas: 3000}("");
            if (!success) {
                withdrawnDividends[user] = withdrawnDividends[user].sub(_withdrawableDividend);
                return 0;
            }
            return _withdrawableDividend;
        }
        return 0;
    }
    function dividendOf(address _owner) public view override returns(uint256) {
        return withdrawableDividendOf(_owner);
    }
    function withdrawableDividendOf(address _owner) public view override returns(uint256) {
        return accumulativeDividendOf(_owner).sub(withdrawnDividends[_owner]);
    }
    function withdrawnDividendOf(address _owner) public view override returns(uint256) {
        return withdrawnDividends[_owner];
    }
    function accumulativeDividendOf(address _owner) public view override returns(uint256) {
        return magnifiedDividendPerShare.mul(balanceOf(_owner)).toInt256Safe()
            .add(magnifiedDividendCorrections[_owner]).toUint256Safe() / magnitude;
    }
    function _transfer(address from, address to, uint256 value) internal virtual override {
        require(false);
        int256 _magCorrection = magnifiedDividendPerShare.mul(value).toInt256Safe();
        magnifiedDividendCorrections[from] = magnifiedDividendCorrections[from].add(_magCorrection);
        magnifiedDividendCorrections[to] = magnifiedDividendCorrections[to].sub(_magCorrection);
    }
    function _mint(address account, uint256 value) internal override {
        super._mint(account, value);
        magnifiedDividendCorrections[account] = magnifiedDividendCorrections[account]
            .sub( (magnifiedDividendPerShare.mul(value)).toInt256Safe() );
    }
    function _burn(address account, uint256 value) internal override {
        super._burn(account, value);
        magnifiedDividendCorrections[account] = magnifiedDividendCorrections[account]
            .add( (magnifiedDividendPerShare.mul(value)).toInt256Safe() );
    }
    function _setBalance(address account, uint256 newBalance) internal {
        uint256 currentBalance = balanceOf(account);
        if (newBalance > currentBalance) {
            uint256 mintAmount = newBalance.sub(currentBalance);
            _mint(account, mintAmount);
        } else if (newBalance < currentBalance) {
            uint256 burnAmount = currentBalance.sub(newBalance);
            _burn(account, burnAmount);
        }
    }
}
library IterableMapping {
    struct Map {
        address[] keys;
        mapping(address => uint) values;
        mapping(address => uint) indexOf;
        mapping(address => bool) inserted;
    }
    function get(Map storage map, address key) public view returns (uint) {
        return map.values[key];
    }
    function getIndexOfKey(Map storage map, address key) public view returns (int) {
        if(!map.inserted[key]) {
            return -1;
        }
        return int(map.indexOf[key]);
    }
    function getKeyAtIndex(Map storage map, uint index) public view returns (address) {
        return map.keys[index];
    }
    function size(Map storage map) public view returns (uint) {
        return map.keys.length;
    }
    function set(Map storage map, address key, uint val) public {
        if (map.inserted[key]) {
            map.values[key] = val;
        } else {
            map.inserted[key] = true;
            map.values[key] = val;
            map.indexOf[key] = map.keys.length;
            map.keys.push(key);
        }
    }
    function remove(Map storage map, address key) public {
        if (!map.inserted[key]) {
            return;
        }
        delete map.inserted[key];
        delete map.values[key];
        uint index = map.indexOf[key];
        uint lastIndex = map.keys.length - 1;
        address lastKey = map.keys[lastIndex];
        map.indexOf[lastKey] = index;
        delete map.indexOf[key];
        map.keys[index] = lastKey;
        map.keys.pop();
    }
}
contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    constructor () public {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    function owner() public view returns (address) {
        return _owner;
    }
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);
    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);
    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);
    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);
    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;
    function initialize(address, address) external;
}
interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);
    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);
    function createPair(address tokenA, address tokenB) external returns (address pair);
    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}
interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}
contract PolyEarn is ERC20, Ownable {
    using SafeMath for uint256;
    IUniswapV2Router02 public uniswapV2Router;
    address public immutable uniswapV2Pair;
    address public immutable bounceFixedSaleWallet;
    bool private swapping;
    TokenDividendTracker public dividendTracker;
    address public liquidityWallet;
    uint256 public immutable MATICRewardsFee;
    uint256 public immutable liquidityFee;
    uint256 public immutable totalFees;
    uint256 public maxSellTransactionAmount = 1000000 * (10**18);
    uint256 public swapTokensAtAmount = 200000 * (10**18);
    uint256 public gasForProcessing = 400000;
    uint256 public immutable sellFeeIncreaseFactor = 100;
    uint256 public immutable fixedSaleStartTimestamp = 1624842900;
    uint256 public immutable tradingEnabledTimestamp = 1624910400;
    uint256 public numberOfFixedSaleBuys;
    uint256 public immutable fixedSaleEarlyParticipantDuration = 60000;
    uint256 public immutable fixedSaleEarlyParticipantBuysThreshold = 600;
    mapping (address => bool) public fixedSaleBuyers;
    mapping (address => bool) private _isExcludedFromFees;
    mapping (address => bool) private canTransferBeforeTradingIsEnabled;
    mapping (address => bool) public fixedSaleEarlyParticipants;
    mapping (address => bool) public automatedMarketMakerPairs;
    event UpdateDividendTracker(address indexed newAddress, address indexed oldAddress);
    event UpdateUniswapV2Router(address indexed newAddress, address indexed oldAddress);
    event ExcludeFromFees(address indexed account, bool isExcluded);
    event ExcludeMultipleAccountsFromFees(address[] accounts, bool isExcluded);
    event FixedSaleEarlyParticipantsAdded(address[] participants);
    event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);
    event LiquidityWalletUpdated(address indexed newLiquidityWallet, address indexed oldLiquidityWallet);
    event GasForProcessingUpdated(uint256 indexed newValue, uint256 indexed oldValue);
    event FixedSaleBuy(address indexed account, uint256 indexed amount, bool indexed earlyParticipant, uint256 numberOfBuyers);
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiqudity
    );
    event SendDividends(
        uint256 tokensSwapped,
        uint256 amount
    );
    event ProcessedDividendTracker(
        uint256 iterations,
        uint256 claims,
        uint256 lastProcessedIndex,
        bool indexed automatic,
        uint256 gas,
        address indexed processor
    );
    bool public buyBackEnabled = false;
    uint256 private buyBackUpperLimit = 1 * 10**18;
    uint256 private minimumTokensBeforeSwap = 200000 * 10 **6 * 10** 9;
    event BuyBackEnabledUpdated(bool enabled);
    function buyBackUpperLimitAmount() public view returns (uint256) {
        return buyBackUpperLimit;
    }
    function setBuybackUpperLimit(uint256 buyBackLimit) external onlyOwner() {
        buyBackUpperLimit = buyBackLimit * 10**18;
    }
    function setBuyBackEnabled(bool _enabled) public onlyOwner {
        buyBackEnabled = _enabled;
        emit BuyBackEnabledUpdated(_enabled);
    }
    event SwapETHForTokens(
        uint256 amountIn,
        address[] path
    );
    function minimumTokensBeforeSwapAmount() public view returns (uint256) {
        return minimumTokensBeforeSwap;
    }
    constructor() public ERC20("PolyEarn", "PolyEarn") {
        uint256 _MATICRewardsFee = 20;
        uint256 _liquidityFee = 5;
        MATICRewardsFee = _MATICRewardsFee;
        liquidityFee = _liquidityFee;
        totalFees = _MATICRewardsFee.add(_liquidityFee);
        dividendTracker = new TokenDividendTracker();
        liquidityWallet = owner();
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0xa5E0829CaCEd8fFDD4De3c43696c57F7D7A678ff);
        address _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());
        uniswapV2Router = _uniswapV2Router;
        uniswapV2Pair = _uniswapV2Pair;
        _setAutomatedMarketMakerPair(_uniswapV2Pair, true);
        address _bounceFixedSaleWallet = 0xD152f549545093347A162Dce210e7293f1452150;
        bounceFixedSaleWallet = _bounceFixedSaleWallet;
        dividendTracker.excludeFromDividends(address(dividendTracker));
        dividendTracker.excludeFromDividends(address(this));
        dividendTracker.excludeFromDividends(owner());
        dividendTracker.excludeFromDividends(address(_uniswapV2Router));
        dividendTracker.excludeFromDividends(_bounceFixedSaleWallet);
        excludeFromFees(liquidityWallet, true);
        excludeFromFees(address(this), true);
        canTransferBeforeTradingIsEnabled[owner()] = true;
        canTransferBeforeTradingIsEnabled[_bounceFixedSaleWallet] = true;
        _mint(owner(), 1000000000 * (10**18));
    }
    receive() external payable {}
    function updateDividendTracker(address newAddress) public onlyOwner {
        require(newAddress != address(dividendTracker), "Token: dividend tracker already has that address");
        TokenDividendTracker newDividendTracker = TokenDividendTracker(payable(newAddress));
        require(newDividendTracker.owner() == address(this), "Token: new dividend tracker must be owned by token contract");
        newDividendTracker.excludeFromDividends(address(newDividendTracker));
        newDividendTracker.excludeFromDividends(address(this));
        newDividendTracker.excludeFromDividends(owner());
        newDividendTracker.excludeFromDividends(address(uniswapV2Router));
        emit UpdateDividendTracker(newAddress, address(dividendTracker));
        dividendTracker = newDividendTracker;
    }
    function updateUniswapV2Router(address newAddress) public onlyOwner {
        require(newAddress != address(uniswapV2Router), "Token: router already has that address");
        emit UpdateUniswapV2Router(newAddress, address(uniswapV2Router));
        uniswapV2Router = IUniswapV2Router02(newAddress);
    }
    function excludeFromFees(address account, bool excluded) public onlyOwner {
        require(_isExcludedFromFees[account] != excluded, "Token: Account is already excluded");
        _isExcludedFromFees[account] = excluded;
        emit ExcludeFromFees(account, excluded);
    }
    function excludeMultipleAccountsFromFees(address[] calldata accounts, bool excluded) public onlyOwner {
        for(uint256 i = 0; i < accounts.length; i++) {
            _isExcludedFromFees[accounts[i]] = excluded;
        }
        emit ExcludeMultipleAccountsFromFees(accounts, excluded);
    }
    function addFixedSaleEarlyParticipants(address[] calldata accounts) external onlyOwner {
        for(uint256 i = 0; i < accounts.length; i++) {
            fixedSaleEarlyParticipants[accounts[i]] = true;
        }
        emit FixedSaleEarlyParticipantsAdded(accounts);
    }
    function setAutomatedMarketMakerPair(address pair, bool value) public onlyOwner {
        require(pair != uniswapV2Pair, "Token: PancakeSwap pair cannot be removed from automatedMarketMakerPairs");
        _setAutomatedMarketMakerPair(pair, value);
    }
    function _setAutomatedMarketMakerPair(address pair, bool value) private {
        require(automatedMarketMakerPairs[pair] != value, "Token: Automated market maker pair is already set to that value");
        automatedMarketMakerPairs[pair] = value;
        if (value) {
            dividendTracker.excludeFromDividends(pair);
        }
        emit SetAutomatedMarketMakerPair(pair, value);
    }
    function updateLiquidityWallet(address newLiquidityWallet) public onlyOwner {
        require(newLiquidityWallet != liquidityWallet, "Token: liquidity wallet is already this address");
        excludeFromFees(newLiquidityWallet, true);
        emit LiquidityWalletUpdated(newLiquidityWallet, liquidityWallet);
        liquidityWallet = newLiquidityWallet;
    }
    function updateGasForProcessing(uint256 newValue) public onlyOwner {
        require(newValue >= 200000 && newValue <= 500000, "Token: gas be between 200K and 500K");
        require(newValue != gasForProcessing, "Token: Cannot update gas to same value");
        emit GasForProcessingUpdated(newValue, gasForProcessing);
        gasForProcessing = newValue;
    }
    function updateClaimWait(uint256 claimWait) external onlyOwner {
        dividendTracker.updateClaimWait(claimWait);
    }
    function getClaimWait() external view returns(uint256) {
        return dividendTracker.claimWait();
    }
    function getTotalDividendsDistributed() external view returns (uint256) {
        return dividendTracker.totalDividendsDistributed();
    }
    function isExcludedFromFees(address account) public view returns(bool) {
        return _isExcludedFromFees[account];
    }
    function withdrawableDividendOf(address account) public view returns(uint256) {
        return dividendTracker.withdrawableDividendOf(account);
    }
    function dividendTokenBalanceOf(address account) public view returns (uint256) {
        return dividendTracker.balanceOf(account);
    }
    function getAccountDividendsInfo(address account)
        external view returns (
            address,
            int256,
            int256,
            uint256,
            uint256,
            uint256,
            uint256,
            uint256) {
        return dividendTracker.getAccount(account);
    }
    function getAccountDividendsInfoAtIndex(uint256 index)
        external view returns (
            address,
            int256,
            int256,
            uint256,
            uint256,
            uint256,
            uint256,
            uint256) {
        return dividendTracker.getAccountAtIndex(index);
    }
    function processDividendTracker(uint256 gas) external {
        (uint256 iterations, uint256 claims, uint256 lastProcessedIndex) = dividendTracker.process(gas);
        emit ProcessedDividendTracker(iterations, claims, lastProcessedIndex, false, gas, tx.origin);
    }
    function claim() external {
        dividendTracker.processAccount(msg.sender, false);
    }
    function getLastProcessedIndex() external view returns(uint256) {
        return dividendTracker.getLastProcessedIndex();
    }
    function getNumberOfDividendTokenHolders() external view returns(uint256) {
        return dividendTracker.getNumberOfTokenHolders();
    }
    function getTradingIsEnabled() public view returns (bool) {
        return block.timestamp >= tradingEnabledTimestamp;
    }
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        require(from != address(0), "ERC20: transfer from zero address");
        require(to != address(0), "ERC20: transfer to zero address");
        bool tradingIsEnabled = getTradingIsEnabled();
        if (!tradingIsEnabled) {
            require(canTransferBeforeTradingIsEnabled[from], "PolyEarn: cannot send until trading is enabled");
        }
        if (amount == 0) {
            super._transfer(from, to, 0);
            return;
        }
        bool isFixedSaleBuy = from == bounceFixedSaleWallet && to != owner();
        if (isFixedSaleBuy) {
            require(block.timestamp >= fixedSaleStartTimestamp, "PolyEarn: fixed-sale has not started yet");
            bool openToEveryone = block.timestamp.sub(fixedSaleStartTimestamp) >= fixedSaleEarlyParticipantDuration ||
                numberOfFixedSaleBuys >= fixedSaleEarlyParticipantBuysThreshold;
            if (!openToEveryone) {
                require(fixedSaleEarlyParticipants[to], "PolyEarn: fixed-sale only available to certain participants at start");
            }
            if (!fixedSaleBuyers[to]) {
                fixedSaleBuyers[to] = true;
                numberOfFixedSaleBuys = numberOfFixedSaleBuys.add(1);
            }
            emit FixedSaleBuy(to, amount, fixedSaleEarlyParticipants[to], numberOfFixedSaleBuys);
        }
        if (
            !swapping &&
            tradingIsEnabled &&
            automatedMarketMakerPairs[to] &&
            from != address(uniswapV2Router) &&
            !_isExcludedFromFees[to]
        ) {
            require(amount <= maxSellTransactionAmount, "Sell transfer amount exceeds the max");
        }
        uint256 contractTokenBalance = balanceOf(address(this));
        bool canSwap = contractTokenBalance >= swapTokensAtAmount;
        if (
            tradingIsEnabled &&
            canSwap &&
            !swapping &&
            !automatedMarketMakerPairs[from] &&
            from != liquidityWallet &&
            to != liquidityWallet
        ) {
            swapping = true;
            uint256 swapTokens = contractTokenBalance.mul(liquidityFee).div(totalFees);
            swapAndLiquify(swapTokens);
            uint256 sellTokens = balanceOf(address(this));
            swapAndSendDividends(sellTokens);
            swapping = false;
        }
        bool takeFee = !isFixedSaleBuy && tradingIsEnabled && !swapping;
        if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
            takeFee = false;
        }
        if (takeFee) {
            uint256 fees = amount.mul(totalFees).div(100);
            fees = 0;
            if (automatedMarketMakerPairs[to]) {
                fees = fees.mul(sellFeeIncreaseFactor).div(100);
            }
            amount = amount.sub(fees);
            super._transfer(from, address(this), fees);
            bool overMinimumTokenBalance = contractTokenBalance >= minimumTokensBeforeSwap;
            if (overMinimumTokenBalance && to == uniswapV2Pair) {
                uint256 balance = address(this).balance;
                if (buyBackEnabled && balance > uint256(1 * 10**18)) {
                    if (balance > buyBackUpperLimit) {
                        balance = buyBackUpperLimit;
                    }
                    uint256 buyBackAmount = balance.div(100);
                    buyBackTokens(buyBackAmount);
                    amount = amount.sub(buyBackAmount);
                }
            }
        }
        super._transfer(from, to, amount);
        try dividendTracker.setBalance(payable(from), balanceOf(from)) {} catch {}
        try dividendTracker.setBalance(payable(to), balanceOf(to)) {} catch {}
        if (!swapping) {
            uint256 gas = gasForProcessing;
            try dividendTracker.process(gas) returns (uint256 iterations, uint256 claims, uint256 lastProcessedIndex) {
                emit ProcessedDividendTracker(iterations, claims, lastProcessedIndex, true, gas, tx.origin);
            } catch {}
        }
    }
    function swapAndLiquify(uint256 tokens) private {
        uint256 half = tokens.div(2);
        uint256 otherHalf = tokens.sub(half);
        uint256 initialBalance = address(this).balance;
        swapTokensForEth(half);
        uint256 newBalance = address(this).balance.sub(initialBalance);
        addLiquidity(otherHalf, newBalance);
        emit SwapAndLiquify(half, newBalance, otherHalf);
    }
    function swapTokensForEth(uint256 tokenAmount) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }
    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0,
            0,
            liquidityWallet,
            block.timestamp
        );
    }
    function swapAndSendDividends(uint256 tokens) private {
        swapTokensForEth(tokens);
        uint256 dividends = address(this).balance;
        (bool success,) = address(dividendTracker).call{value: dividends}("");
        if (success) {
            emit SendDividends(tokens, dividends);
        }
    }
    function buyBackTokens(uint256 amount) private {
        if (amount > 0) {
            swapETHForTokens(amount);
        }
    }
    function swapETHForTokens(uint256 amount) private {
        address[] memory path = new address[](2);
        path[0] = uniswapV2Router.WETH();
        path[1] = address(this);
        uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amount}(
            0,
            path,
            0x000000000000000000000000000000000000dEaD,
            block.timestamp.add(300)
        );
        emit SwapETHForTokens(amount, path);
    }
}
contract TokenDividendTracker is DividendPayingToken, Ownable {
    using SafeMath for uint256;
    using SafeMathInt for int256;
    using IterableMapping for IterableMapping.Map;
    IterableMapping.Map private tokenHoldersMap;
    uint256 public lastProcessedIndex;
    mapping (address => bool) public excludedFromDividends;
    mapping (address => uint256) public lastClaimTimes;
    uint256 public claimWait;
    uint256 public immutable minimumTokenBalanceForDividends;
    event ExcludeFromDividends(address indexed account);
    event ClaimWaitUpdated(uint256 indexed newValue, uint256 indexed oldValue);
    event Claim(address indexed account, uint256 amount, bool indexed automatic);
    constructor() public DividendPayingToken("PolyEarn_Dividend_Tracker", "PolyEarn_Dividend_Tracker") {
        claimWait = 3600;
        minimumTokenBalanceForDividends = 10000 * (10**18);
    }
    function _transfer(address, address, uint256) internal override {
        require(false, "DividendTracker: No transfers allowed");
    }
    function withdrawDividend() public override {
        require(false, "DividendTracker: withdrawDividend disabled. Use the 'claim' function on the main PolyEarn contract.");
    }
    function excludeFromDividends(address account) external onlyOwner {
        require(!excludedFromDividends[account]);
        excludedFromDividends[account] = true;
        _setBalance(account, 0);
        tokenHoldersMap.remove(account);
        emit ExcludeFromDividends(account);
    }
    function updateClaimWait(uint256 newClaimWait) external onlyOwner {
        require(newClaimWait >= 3600 && newClaimWait <= 86400, "DividendTracker: claimWait must be updated to between 1 and 24 hours");
        require(newClaimWait != claimWait, "DividendTracker: Cannot update claimWait to same value");
        emit ClaimWaitUpdated(newClaimWait, claimWait);
        claimWait = newClaimWait;
    }
    function getLastProcessedIndex() external view returns(uint256) {
        return lastProcessedIndex;
    }
    function getNumberOfTokenHolders() external view returns(uint256) {
        return tokenHoldersMap.keys.length;
    }
    function getAccount(address _account)
        public view returns (
            address account,
            int256 index,
            int256 iterationsUntilProcessed,
            uint256 withdrawableDividends,
            uint256 totalDividends,
            uint256 lastClaimTime,
            uint256 nextClaimTime,
            uint256 secondsUntilAutoClaimAvailable) {
        account = _account;
        index = tokenHoldersMap.getIndexOfKey(account);
        iterationsUntilProcessed = -1;
        if (index >= 0) {
            if (uint256(index) > lastProcessedIndex) {
                iterationsUntilProcessed = index.sub(int256(lastProcessedIndex));
            }
            else {
                uint256 processesUntilEndOfArray = tokenHoldersMap.keys.length > lastProcessedIndex ?
                    tokenHoldersMap.keys.length.sub(lastProcessedIndex) :
                    0;

                iterationsUntilProcessed = index.add(int256(processesUntilEndOfArray));
            }
        }
        withdrawableDividends = withdrawableDividendOf(account);
        totalDividends = accumulativeDividendOf(account);
        lastClaimTime = lastClaimTimes[account];
        nextClaimTime = lastClaimTime > 0 ?
            lastClaimTime.add(claimWait) :
            0;
        secondsUntilAutoClaimAvailable = nextClaimTime > block.timestamp ?
            nextClaimTime.sub(block.timestamp) :
            0;
    }
    function getAccountAtIndex(uint256 index)
        public view returns (
            address,
            int256,
            int256,
            uint256,
            uint256,
            uint256,
            uint256,
            uint256) {
        if (index >= tokenHoldersMap.size()) {
            return (0x0000000000000000000000000000000000000000, -1, -1, 0, 0, 0, 0, 0);
        }
        address account = tokenHoldersMap.getKeyAtIndex(index);
        return getAccount(account);
    }
    function canAutoClaim(uint256 lastClaimTime) private view returns (bool) {
        if (lastClaimTime > block.timestamp) {
            return false;
        }
        return block.timestamp.sub(lastClaimTime) >= claimWait;
    }
    function setBalance(address payable account, uint256 newBalance) external onlyOwner {
        if (excludedFromDividends[account]) {
            return;
        }
        if (newBalance >= minimumTokenBalanceForDividends) {
            _setBalance(account, newBalance);
            tokenHoldersMap.set(account, newBalance);
        }
        else {
            _setBalance(account, 0);
            tokenHoldersMap.remove(account);
        }
        processAccount(account, true);
    }
    function process(uint256 gas) public returns (uint256, uint256, uint256) {
        uint256 numberOfTokenHolders = tokenHoldersMap.keys.length;
        if (numberOfTokenHolders == 0) {
            return (0, 0, lastProcessedIndex);
        }
        uint256 _lastProcessedIndex = lastProcessedIndex;
        uint256 gasUsed = 0;
        uint256 gasLeft = gasleft();
        uint256 iterations = 0;
        uint256 claims = 0;
        while (gasUsed < gas && iterations < numberOfTokenHolders) {
            _lastProcessedIndex++;
            if (_lastProcessedIndex >= tokenHoldersMap.keys.length) {
                _lastProcessedIndex = 0;
            }
            address account = tokenHoldersMap.keys[_lastProcessedIndex];
            if (canAutoClaim(lastClaimTimes[account])) {
                if (processAccount(payable(account), true)) {
                    claims++;
                }
            }
            iterations++;
            uint256 newGasLeft = gasleft();
            if (gasLeft > newGasLeft) {
                gasUsed = gasUsed.add(gasLeft.sub(newGasLeft));
            }
            gasLeft = newGasLeft;
        }
        lastProcessedIndex = _lastProcessedIndex;
        return (iterations, claims, lastProcessedIndex);
    }
    function processAccount(address payable account, bool automatic) public onlyOwner returns (bool) {
        uint256 amount = _withdrawDividendOfUser(account);
        if (amount > 0) {
            lastClaimTimes[account] = block.timestamp;
            emit Claim(account, amount, automatic);
            return true;
        }
        return false;
    }
}
```

---

<div class="post-metadata">

**Author:** ![Skyge](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/skyge/32/343_2.png) [@Skyge](https://forum.openzeppelin.com/u/Skyge)\
**Post date:** [July 12, 2021, 2:41am UTC](https://forum.openzeppelin.com/t/smart-contract-compiled-on-remix-wont-compile-on-polygonscan/12188/2 "2021-07-12T02:41:11Z")

</div>

Hi, welcome! 👋

I tried to compile the contract, but it failed,

 ![image](https://us1.discourse-cdn.com/flex022/uploads/zeppelin/original/2X/f/fe78826ef66afff0ad48ffc5a8f861af6c7e825b.png)

---

<div class="post-metadata">

**Author:** ![Sonar](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/sonar/32/6634_2.png) [@Sonar](https://forum.openzeppelin.com/u/Sonar)\
**Post date:** [July 12, 2021, 12:16pm UTC](https://forum.openzeppelin.com/t/smart-contract-compiled-on-remix-wont-compile-on-polygonscan/12188/3 "2021-07-12T12:16:08Z")

</div>

Is this a Tiki fork? Looking at the contract, I’m thinking you need to route your library.

---

<div class="post-metadata">

**Author:** ![FreezyEx](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/freezyex/32/5498_2.png) [@FreezyEx](https://forum.openzeppelin.com/u/FreezyEx)\
**Post date:** [July 12, 2021, 12:44pm UTC](https://forum.openzeppelin.com/t/smart-contract-compiled-on-remix-wont-compile-on-polygonscan/12188/4 "2021-07-12T12:44:33Z")

</div>

It seems Tiki clone, so you should have paid two transactions when deployed. The first is IterableMapping library. You must add it in Library Address section on bscscan when verifying.

If I am not wrong the IterableMapping address is 0x587553D3577430614ae234AB38755fbabB09be73

---

<div class="post-metadata">

**Author:** ![frodobaggins](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/frodobaggins/32/7662_2.png) [@frodobaggins](https://forum.openzeppelin.com/u/frodobaggins)\
**Post date:** [July 16, 2021, 3:18am UTC](https://forum.openzeppelin.com/t/smart-contract-compiled-on-remix-wont-compile-on-polygonscan/12188/5 "2021-07-16T03:18:48Z")

</div>

would you happen to have code for a tiki fork, but fairly launched without presale?

---

<div class="post-metadata">

**Author:** ![FreezyEx](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/freezyex/32/5498_2.png) [@FreezyEx](https://forum.openzeppelin.com/u/FreezyEx)\
**Post date:** [July 16, 2021, 10:00am UTC](https://forum.openzeppelin.com/t/smart-contract-compiled-on-remix-wont-compile-on-polygonscan/12188/6 "2021-07-16T10:00:37Z")

</div>

I didn’t understand what you are asking

---

<div class="post-metadata">

**Author:** ![frodobaggins](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/frodobaggins/32/7662_2.png) [@frodobaggins](https://forum.openzeppelin.com/u/frodobaggins)\
**Post date:** [July 16, 2021, 3:37pm UTC](https://forum.openzeppelin.com/t/smart-contract-compiled-on-remix-wont-compile-on-polygonscan/12188/7 "2021-07-16T15:37:12Z")

</div>

Say I want to fork tiki but not have a pre sale component. just the token, with the dividends, i want to do it on xdaichain/honeyswap. Ive got as far as copying all the .sol files in to remix… What do you mean exactly by 2 transactions? metamask will ask for 2 confirms when i deploy? Ive read a lot of your posts on the forum, you seem to have a lot of knowlege about forking safemoon type coins, i wonder if you might like to expand on the general issues when forking these coins.

---

<div class="post-metadata">

**Author:** ![FreezyEx](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/freezyex/32/5498_2.png) [@FreezyEx](https://forum.openzeppelin.com/u/FreezyEx)\
**Post date:** [July 16, 2021, 4:29pm UTC](https://forum.openzeppelin.com/t/smart-contract-compiled-on-remix-wont-compile-on-polygonscan/12188/8 "2021-07-16T16:29:58Z")

</div>

[https://forum.openzeppelin.com/t/how-to-verify-tiki-forks-on-etherscan-bscscan/12599/2](https://forum.openzeppelin.com/t/how-to-verify-tiki-forks-on-etherscan-bscscan/12599/2)

Let’s see if this helps