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// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    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);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "./interfaces/IERC20ConversionProxy.sol";
import "./interfaces/IEthConversionProxy.sol";
import "./BatchNoConversionPayments.sol";

/**
 * @title BatchConversionPayments
 * @notice This contract makes multiple conversion payments with references, in one transaction:
 *          - on:
 *              - ERC20 tokens: using Erc20ConversionProxy and ERC20FeeProxy
 *              - Native tokens: (e.g. ETH) using EthConversionProxy and EthereumFeeProxy
 *          - to: multiple addresses
 *          - fees: conversion proxy fees and additional batch conversion fees are paid to the same address.
 *         batchPayments is the main function to batch all kinds of payments at once.
 *         If one transaction of the batch fails, all transactions are reverted.
 * @dev batchPayments is the main function, but other batch payment functions are "public" in order to do
 *      gas optimization in some cases.
 */
contract BatchConversionPayments is BatchNoConversionPayments {
    using SafeERC20 for IERC20;

    IERC20ConversionProxy public paymentErc20ConversionProxy;
    IEthConversionProxy public paymentNativeConversionProxy;

    /** payerAuthorized is set to true to workaround the non-payable aspect in batch native conversion */
    bool private payerAuthorized = false;

    /**
     * @dev Used by the batchPayments to handle information for heterogeneous batches, grouped by payment network:
     *  - paymentNetworkId: from 0 to 4, cf. `batchPayments()` method
     *  - requestDetails all the data required for conversion and no conversion requests to be paid
     */
    struct MetaDetail {
        uint256 paymentNetworkId;
        RequestDetail[] requestDetails;
    }

    /**
     * @param _paymentErc20Proxy The ERC20 payment proxy address to use.
     * @param _paymentNativeProxy The native payment proxy address to use.
     * @param _paymentErc20ConversionProxy The ERC20 Conversion payment proxy address to use.
     * @param _paymentNativeConversionFeeProxy The native Conversion payment proxy address to use.
     * @param _chainlinkConversionPath The address of the conversion path contract.
     * @param _owner Owner of the contract.
     */
    constructor(
        address _paymentErc20Proxy,
        address _paymentNativeProxy,
        address _paymentErc20ConversionProxy,
        address _paymentNativeConversionFeeProxy,
        address _chainlinkConversionPath,
        address _owner
    )
        BatchNoConversionPayments(
            _paymentErc20Proxy,
            _paymentNativeProxy,
            _chainlinkConversionPath,
            _owner
        )
    {
        paymentErc20ConversionProxy = IERC20ConversionProxy(
            _paymentErc20ConversionProxy
        );
        paymentNativeConversionProxy = IEthConversionProxy(
            _paymentNativeConversionFeeProxy
        );
    }

    /**
     * This contract is non-payable.
     * Making a Native payment with conversion requires the contract to accept incoming Native tokens.
     * @dev See the end of `paymentNativeConversionProxy.transferWithReferenceAndFee` where the leftover is given back.
     */
    receive() external payable override {
        require(payerAuthorized || msg.value == 0, "Non-payable");
    }

    /**
     * @notice Batch payments on different payment networks at once.
     * @param metaDetails contains paymentNetworkId and requestDetails
     * - batchMultiERC20ConversionPayments, paymentNetworkId=0
     * - batchERC20Payments, paymentNetworkId=1
     * - batchMultiERC20Payments, paymentNetworkId=2
     * - batchNativePayments, paymentNetworkId=3
     * - batchNativeConversionPayments, paymentNetworkId=4
     * If metaDetails use paymentNetworkId = 4, it must be at the end of the list, or the transaction can be reverted.
     * @param pathsToUSD The list of paths into USD for every token, used to limit the batch fees.
     *                   For batch native, mock an array of array to apply the limit, e.g: [[]]
     *                   Without paths, there is not limitation, neither for the batch native functions.
     * @param feeAddress The address where fees should be paid.
     * @dev Use pathsToUSD only if you are pretty sure the batch fees will higher than the
     *      USD limit batchFeeAmountUSDLimit, because it increase gas consumption.
     *      batchPayments only reduces gas consumption when using more than a single payment network.
     *      For single payment network payments, it is more efficient to use the suited batch function.
     */
    function batchPayments(
        MetaDetail[] calldata metaDetails,
        address[][] calldata pathsToUSD,
        address feeAddress
    ) external payable {
        require(metaDetails.length < 6, "more than 5 metaDetails");

        uint256 batchFeeAmountUSD = 0;
        for (uint256 i = 0; i < metaDetails.length; i++) {
            MetaDetail calldata metaDetail = metaDetails[i];
            if (metaDetail.paymentNetworkId == 0) {
                batchFeeAmountUSD += _batchMultiERC20ConversionPayments(
                    metaDetail.requestDetails,
                    batchFeeAmountUSD,
                    pathsToUSD,
                    feeAddress
                );
            } else if (metaDetail.paymentNetworkId == 1) {
                batchFeeAmountUSD += _batchERC20Payments(
                    metaDetail.requestDetails,
                    pathsToUSD,
                    batchFeeAmountUSD,
                    payable(feeAddress)
                );
            } else if (metaDetail.paymentNetworkId == 2) {
                batchFeeAmountUSD += _batchMultiERC20Payments(
                    metaDetail.requestDetails,
                    pathsToUSD,
                    batchFeeAmountUSD,
                    feeAddress
                );
            } else if (metaDetail.paymentNetworkId == 3) {
                if (metaDetails[metaDetails.length - 1].paymentNetworkId == 4) {
                    // Set to false only if batchNativeConversionPayments is called after this function
                    transferBackRemainingNativeTokens = false;
                }
                batchFeeAmountUSD += _batchNativePayments(
                    metaDetail.requestDetails,
                    pathsToUSD.length == 0,
                    batchFeeAmountUSD,
                    payable(feeAddress)
                );
                if (metaDetails[metaDetails.length - 1].paymentNetworkId == 4) {
                    transferBackRemainingNativeTokens = true;
                }
            } else if (metaDetail.paymentNetworkId == 4) {
                batchFeeAmountUSD += _batchNativeConversionPayments(
                    metaDetail.requestDetails,
                    pathsToUSD.length == 0,
                    batchFeeAmountUSD,
                    payable(feeAddress)
                );
            } else {
                revert("Wrong paymentNetworkId");
            }
        }
    }

    /**
     * @notice Send a batch of ERC20 payments with amounts based on a request
     * currency (e.g. fiat), with fees and paymentReferences to multiple accounts, with multiple tokens.
     * @param requestDetails List of ERC20 requests denominated in fiat to pay.
     * @param pathsToUSD The list of paths into USD for every token, used to limit the batch fees.
     *                   Without paths, there is not a fee limitation, and it consumes less gas.
     * @param feeAddress The fee recipient.
     */
    function batchMultiERC20ConversionPayments(
        RequestDetail[] calldata requestDetails,
        address[][] calldata pathsToUSD,
        address feeAddress
    ) public returns (uint256) {
        return
            _batchMultiERC20ConversionPayments(
                requestDetails,
                0,
                pathsToUSD,
                feeAddress
            );
    }

    /**
     * @notice Send a batch of Native conversion payments with fees and paymentReferences to multiple accounts.
     *         If one payment fails, the whole batch is reverted.
     * @param requestDetails List of native requests denominated in fiat to pay.
     * @param skipFeeUSDLimit Setting the value to true skips the USD fee limit, and reduces gas consumption.
     * @param feeAddress The fee recipient.
     * @dev It uses NativeConversionProxy (EthereumConversionProxy) to pay an invoice and fees.
     *      Please:
     *        Note that if there is not enough Native token attached to the function call,
     *        the following error is thrown: "revert paymentProxy transferExactEthWithReferenceAndFee failed"
     */
    function batchNativeConversionPayments(
        RequestDetail[] calldata requestDetails,
        bool skipFeeUSDLimit,
        address payable feeAddress
    ) public payable returns (uint256) {
        return
            _batchNativeConversionPayments(
                requestDetails,
                skipFeeUSDLimit,
                0,
                feeAddress
            );
    }

    /**
     * @notice Send a batch of ERC20 payments with amounts based on a request
     * currency (e.g. fiat), with fees and paymentReferences to multiple accounts, with multiple tokens.
     * @param requestDetails List of ERC20 requests denominated in fiat to pay.
     * @param batchFeeAmountUSD The batch fee amount in USD already paid.
     * @param pathsToUSD The list of paths into USD for every token, used to limit the batch fees.
     *                   Without paths, there is not a fee limitation, and it consumes less gas.
     * @param feeAddress The fee recipient.
     */
    function _batchMultiERC20ConversionPayments(
        RequestDetail[] calldata requestDetails,
        uint256 batchFeeAmountUSD,
        address[][] calldata pathsToUSD,
        address feeAddress
    ) private returns (uint256) {
        Token[] memory uTokens = getUTokens(requestDetails);

        IERC20 requestedToken;
        // For each token: check allowance, transfer funds on the contract and approve the paymentProxy to spend if needed
        for (
            uint256 k = 0;
            k < uTokens.length && uTokens[k].amountAndFee > 0;
            k++
        ) {
            uTokens[k].batchFeeAmount =
                (uTokens[k].amountAndFee * batchFee) /
                feeDenominator;
            requestedToken = IERC20(uTokens[k].tokenAddress);
            transferToContract(
                requestedToken,
                uTokens[k].amountAndFee,
                uTokens[k].batchFeeAmount,
                address(paymentErc20ConversionProxy)
            );
        }

        // Batch pays the requests using Erc20ConversionFeeProxy
        for (uint256 i = 0; i < requestDetails.length; i++) {
            RequestDetail calldata rD = requestDetails[i];
            paymentErc20ConversionProxy.transferFromWithReferenceAndFee(
                rD.recipient,
                rD.requestAmount,
                rD.path,
                rD.paymentReference,
                rD.feeAmount,
                feeAddress,
                rD.maxToSpend,
                rD.maxRateTimespan
            );
        }

        // Batch sends back to the payer the tokens not spent and pays the batch fee
        for (
            uint256 k = 0;
            k < uTokens.length && uTokens[k].amountAndFee > 0;
            k++
        ) {
            requestedToken = IERC20(uTokens[k].tokenAddress);

            // Batch sends back to the payer the tokens not spent = excessAmount
            // excessAmount = maxToSpend - reallySpent, which is equal to the remaining tokens on the contract
            uint256 excessAmount = requestedToken.balanceOf(address(this));
            if (excessAmount > 0) {
                requestedToken.safeTransfer(msg.sender, excessAmount);
            }

            // Calculate batch fee to pay
            uint256 batchFeeToPay = ((uTokens[k].amountAndFee - excessAmount) *
                batchFee) / feeDenominator;

            (batchFeeToPay, batchFeeAmountUSD) = calculateBatchFeeToPay(
                batchFeeToPay,
                uTokens[k].tokenAddress,
                batchFeeAmountUSD,
                pathsToUSD
            );

            // Payer pays the exact batch fees amount
            require(
                safeTransferFrom(
                    uTokens[k].tokenAddress,
                    feeAddress,
                    batchFeeToPay
                ),
                "Batch fee transferFrom() failed"
            );
        }
        return batchFeeAmountUSD;
    }

    /**
     * @notice Send a batch of Native conversion payments with fees and paymentReferences to multiple accounts.
     *         If one payment fails, the whole batch is reverted.
     * @param requestDetails List of native requests denominated in fiat to pay.
     * @param skipFeeUSDLimit Setting the value to true skips the USD fee limit, and reduces gas consumption.
     * @param batchFeeAmountUSD The batch fee amount in USD already paid.
     * @param feeAddress The fee recipient.
     * @dev It uses NativeConversionProxy (EthereumConversionProxy) to pay an invoice and fees.
     *      Please:
     *        Note that if there is not enough Native token attached to the function call,
     *        the following error is thrown: "revert paymentProxy transferExactEthWithReferenceAndFee failed"
     */
    function _batchNativeConversionPayments(
        RequestDetail[] calldata requestDetails,
        bool skipFeeUSDLimit,
        uint256 batchFeeAmountUSD,
        address payable feeAddress
    ) private returns (uint256) {
        uint256 contractBalance = address(this).balance;
        payerAuthorized = true;

        // Batch contract pays the requests through nativeConversionProxy
        for (uint256 i = 0; i < requestDetails.length; i++) {
            RequestDetail calldata rD = requestDetails[i];
            paymentNativeConversionProxy.transferWithReferenceAndFee{
                value: address(this).balance
            }(
                payable(rD.recipient),
                rD.requestAmount,
                rD.path,
                rD.paymentReference,
                rD.feeAmount,
                feeAddress,
                rD.maxRateTimespan
            );
        }

        // Batch contract pays batch fee
        uint256 batchFeeToPay = (((contractBalance - address(this).balance)) *
            batchFee) / feeDenominator;

        if (skipFeeUSDLimit == false) {
            (batchFeeToPay, batchFeeAmountUSD) = calculateBatchFeeToPay(
                batchFeeToPay,
                pathsNativeToUSD[0][0],
                batchFeeAmountUSD,
                pathsNativeToUSD
            );
        }

        require(
            address(this).balance >= batchFeeToPay,
            "Not enough funds for batch conversion fees"
        );
        feeAddress.transfer(batchFeeToPay);

        // Batch contract transfers the remaining native tokens to the payer
        (bool sendBackSuccess, ) = payable(msg.sender).call{
            value: address(this).balance
        }("");
        require(sendBackSuccess, "Could not send remaining funds to the payer");
        payerAuthorized = false;

        return batchFeeAmountUSD;
    }

    /*
     * Admin functions to edit the conversion proxies address and fees.
     */

    /**
     * @param _paymentErc20ConversionProxy The address of the ERC20 Conversion payment proxy to use.
     *        Update cautiously, the proxy has to match the invoice proxy.
     */
    function setPaymentErc20ConversionProxy(
        address _paymentErc20ConversionProxy
    ) external onlyOwner {
        paymentErc20ConversionProxy = IERC20ConversionProxy(
            _paymentErc20ConversionProxy
        );
    }

    /**
     * @param _paymentNativeConversionProxy The address of the native Conversion payment proxy to use.
     *        Update cautiously, the proxy has to match the invoice proxy.
     */
    function setPaymentNativeConversionProxy(
        address _paymentNativeConversionProxy
    ) external onlyOwner {
        paymentNativeConversionProxy = IEthConversionProxy(
            _paymentNativeConversionProxy
        );
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./lib/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./interfaces/ERC20FeeProxy.sol";
import "./interfaces/EthereumFeeProxy.sol";
import "./ChainlinkConversionPath.sol";

/**
 * @title BatchNoConversionPayments
 * @notice  This contract makes multiple payments with references, in one transaction:
 *          - on: ERC20 Payment Proxy and Native (ETH) Payment Proxy of the Request Network protocol
 *          - to: multiple addresses
 *          - fees: ERC20 and Native (ETH) proxies fees are paid to the same address
 *                  An additional batch fee is paid to the same address
 *         If one transaction of the batch fail, every transactions are reverted.
 * @dev It is a clone of BatchPayment.sol, with three main modifications:
 *         - function "receive" has one other condition: payerAuthorized
 *         - fees are now divided by 10_000 instead of 1_000 in previous version
 *         - batch payment functions have new names and are now public, instead of external
 */
contract BatchNoConversionPayments is Ownable {
    using SafeERC20 for IERC20;

    IERC20FeeProxy public paymentErc20Proxy;
    IEthereumFeeProxy public paymentNativeProxy;
    ChainlinkConversionPath public chainlinkConversionPath;

    /** Used to calculate batch fees: batchFee = 30 represent 0.30% of fee */
    uint16 public batchFee = 0;
    /** Used to calculate batch fees: divide batchFee by feeDenominator */
    uint16 internal feeDenominator = 10000;
    /** The amount of the batch fee cannot exceed a predefined amount in USD, e.g:
      batchFeeAmountUSDLimit = 150 * 1e8 represents $150 */
    uint64 public batchFeeAmountUSDLimit = 15000000000;

    /** transferBackRemainingNativeTokens is set to false only if the payer use batchPayments
  and call both batchNativePayments and batchNativeConversionPayments */
    bool internal transferBackRemainingNativeTokens = true;

    address public USDAddress = 0x775EB53d00DD0Acd3EC1696472105d579B9b386b;
    address public NativeAddress = 0xF5AF88e117747e87fC5929F2ff87221B1447652E;
    address[][] public pathsNativeToUSD;

    /** Contains the address of a token, the sum of the amount and fees paid with it, and the batch fee amount */
    struct Token {
        address tokenAddress;
        uint256 amountAndFee;
        uint256 batchFeeAmount;
    }

    /**
     * @dev All the information of a request, except the feeAddress
     *   recipient: Recipient address of the payment
     *   requestAmount: Request amount, in fiat for conversion payment
     *   path: Only for conversion payment: the conversion path
     *   paymentReference: Unique reference of the payment
     *   feeAmount: The fee amount, denominated in the first currency of `path` for conversion payment
     *   maxToSpend: Only for conversion payment:
     *               Maximum amount the payer wants to spend, denominated in the last currency of `path`:
     *                it includes fee proxy but NOT the batch fees to pay
     *   maxRateTimespan: Only for conversion payment:
     *                    Max acceptable times span for conversion rates, ignored if zero
     */
    struct RequestDetail {
        address recipient;
        uint256 requestAmount;
        address[] path;
        bytes paymentReference;
        uint256 feeAmount;
        uint256 maxToSpend;
        uint256 maxRateTimespan;
    }

    /**
     * @param _paymentErc20Proxy The address to the ERC20 fee payment proxy to use.
     * @param _paymentNativeProxy The address to the Native fee payment proxy to use.
     * @param _chainlinkConversionPath The address of the conversion path contract.
     * @param _owner Owner of the contract.
     */
    constructor(
        address _paymentErc20Proxy,
        address _paymentNativeProxy,
        address _chainlinkConversionPath,
        address _owner
    ) {
        paymentErc20Proxy = IERC20FeeProxy(_paymentErc20Proxy);
        paymentNativeProxy = IEthereumFeeProxy(_paymentNativeProxy);
        chainlinkConversionPath = ChainlinkConversionPath(
            _chainlinkConversionPath
        );
        transferOwnership(_owner);
        batchFee = 0;
    }

    /**
     * This contract is non-payable.
     * @dev See the end of `paymentNativeProxy.transferWithReferenceAndFee` where the leftover is given back.
     */
    receive() external payable virtual {
        require(msg.value == 0, "Non-payable");
    }

    /**
     * @notice Gets batch fee
     */
    function getBatchFee() external view returns (uint256 data) {
        return batchFee;
    }

    /**
     * @notice Send a batch of Native token payments with fees and paymentReferences to multiple accounts.
     *         If one payment fails, the whole batch reverts.
     * @param requestDetails List of Native tokens requests to pay.
     * @param skipFeeUSDLimit Setting the value to true skips the USD fee limit, and reduces gas consumption.
     * @param feeAddress The fee recipient.
     * @dev It uses NativeFeeProxy (EthereumFeeProxy) to pay an invoice and fees with a payment reference.
     *      Make sure: msg.value >= sum(_amouts)+sum(_feeAmounts)+sumBatchFeeAmount
     */
    function batchNativePayments(
        RequestDetail[] calldata requestDetails,
        bool skipFeeUSDLimit,
        address payable feeAddress
    ) public payable returns (uint256) {
        return
            _batchNativePayments(
                requestDetails,
                skipFeeUSDLimit,
                0,
                payable(feeAddress)
            );
    }

    /**
     * @notice Send a batch of ERC20 payments with fees and paymentReferences to multiple accounts.
     * @param requestDetails List of ERC20 requests to pay, with only one ERC20 token.
     * @param pathsToUSD The list of paths into USD for every token, used to limit the batch fees.
     *                   Without paths, there is not a fee limitation, and it consumes less gas.
     * @param feeAddress The fee recipient.
     * @dev Uses ERC20FeeProxy to pay an invoice and fees, with a payment reference.
     *      Make sure this contract has enough allowance to spend the payer's token.
     *      Make sure the payer has enough tokens to pay the amount, the fee, and the batch fee.
     */
    function batchERC20Payments(
        RequestDetail[] calldata requestDetails,
        address[][] calldata pathsToUSD,
        address feeAddress
    ) public returns (uint256) {
        return _batchERC20Payments(requestDetails, pathsToUSD, 0, feeAddress);
    }

    /**
     * @notice Send a batch of ERC20 payments with fees and paymentReferences to multiple accounts, with multiple tokens.
     * @param requestDetails List of ERC20 requests to pay.
     * @param pathsToUSD The list of paths into USD for every token, used to limit the batch fees.
     *                   Without paths, there is not a fee limitation, and it consumes less gas.
     * @param feeAddress The fee recipient.
     * @dev It uses ERC20FeeProxy to pay an invoice and fees, with a payment reference.
     *      Make sure this contract has enough allowance to spend the payer's token.
     *      Make sure the payer has enough tokens to pay the amount, the fee, and the batch fee.
     */
    function batchMultiERC20Payments(
        RequestDetail[] calldata requestDetails,
        address[][] calldata pathsToUSD,
        address feeAddress
    ) public returns (uint256) {
        return
            _batchMultiERC20Payments(requestDetails, pathsToUSD, 0, feeAddress);
    }

    /**
     * @notice Send a batch of Native token payments with fees and paymentReferences to multiple accounts.
     *         If one payment fails, the whole batch reverts.
     * @param requestDetails List of Native tokens requests to pay.
     * @param skipFeeUSDLimit Setting the value to true skips the USD fee limit, and reduces gas consumption.
     * @param batchFeeAmountUSD The batch fee amount in USD already paid.
     * @param feeAddress The fee recipient.
     * @dev It uses NativeFeeProxy (EthereumFeeProxy) to pay an invoice and fees with a payment reference.
     *      Make sure: msg.value >= sum(_amouts)+sum(_feeAmounts)+sumBatchFeeAmount
     */
    function _batchNativePayments(
        RequestDetail[] calldata requestDetails,
        bool skipFeeUSDLimit,
        uint256 batchFeeAmountUSD,
        address payable feeAddress
    ) internal returns (uint256) {
        // amount is used to get the total amount and then used as batch fee amount
        uint256 amount = 0;

        // Batch contract pays the requests thourgh NativeFeeProxy (EthFeeProxy)
        for (uint256 i = 0; i < requestDetails.length; i++) {
            RequestDetail calldata rD = requestDetails[i];
            require(
                address(this).balance >= rD.requestAmount + rD.feeAmount,
                "Not enough funds"
            );
            amount += rD.requestAmount;

            paymentNativeProxy.transferWithReferenceAndFee{
                value: rD.requestAmount + rD.feeAmount
            }(
                payable(rD.recipient),
                rD.paymentReference,
                rD.feeAmount,
                payable(feeAddress)
            );
        }

        // amount is updated into batch fee amount
        amount = (amount * batchFee) / feeDenominator;
        if (skipFeeUSDLimit == false) {
            (amount, batchFeeAmountUSD) = calculateBatchFeeToPay(
                amount,
                pathsNativeToUSD[0][0],
                batchFeeAmountUSD,
                pathsNativeToUSD
            );
        }
        // Check that batch contract has enough funds to pay batch fee
        require(
            address(this).balance >= amount,
            "Not enough funds for batch fee"
        );
        // Batch pays batch fee
        feeAddress.transfer(amount);

        // Batch contract transfers the remaining Native tokens to the payer
        if (transferBackRemainingNativeTokens && address(this).balance > 0) {
            (bool sendBackSuccess, ) = payable(msg.sender).call{
                value: address(this).balance
            }("");
            require(
                sendBackSuccess,
                "Could not send remaining funds to the payer"
            );
        }
        return batchFeeAmountUSD;
    }

    /**
     * @notice Send a batch of ERC20 payments with fees and paymentReferences to multiple accounts.
     * @param requestDetails List of ERC20 requests to pay, with only one ERC20 token.
     * @param pathsToUSD The list of paths into USD for every token, used to limit the batch fees.
     *                   Without paths, there is not a fee limitation, and it consumes less gas.
     * @param batchFeeAmountUSD The batch fee amount in USD already paid.
     * @param feeAddress The fee recipient.
     * @dev Uses ERC20FeeProxy to pay an invoice and fees, with a payment reference.
     *      Make sure this contract has enough allowance to spend the payer's token.
     *      Make sure the payer has enough tokens to pay the amount, the fee, and the batch fee.
     */
    function _batchERC20Payments(
        RequestDetail[] calldata requestDetails,
        address[][] calldata pathsToUSD,
        uint256 batchFeeAmountUSD,
        address feeAddress
    ) internal returns (uint256) {
        uint256 amountAndFee = 0;
        uint256 batchFeeAmount = 0;
        for (uint256 i = 0; i < requestDetails.length; i++) {
            amountAndFee +=
                requestDetails[i].requestAmount +
                requestDetails[i].feeAmount;
            batchFeeAmount += requestDetails[i].requestAmount;
        }
        batchFeeAmount = (batchFeeAmount * batchFee) / feeDenominator;

        // batchFeeToPay and batchFeeAmountUSD are updated if needed
        (batchFeeAmount, batchFeeAmountUSD) = calculateBatchFeeToPay(
            batchFeeAmount,
            requestDetails[0].path[0],
            batchFeeAmountUSD,
            pathsToUSD
        );

        IERC20 requestedToken = IERC20(requestDetails[0].path[0]);

        transferToContract(
            requestedToken,
            amountAndFee,
            batchFeeAmount,
            address(paymentErc20Proxy)
        );

        // Payer pays batch fee amount
        require(
            safeTransferFrom(
                requestDetails[0].path[0],
                feeAddress,
                batchFeeAmount
            ),
            "Batch fee transferFrom() failed"
        );

        // Batch contract pays the requests using Erc20FeeProxy
        for (uint256 i = 0; i < requestDetails.length; i++) {
            RequestDetail calldata rD = requestDetails[i];
            paymentErc20Proxy.transferFromWithReferenceAndFee(
                rD.path[0],
                rD.recipient,
                rD.requestAmount,
                rD.paymentReference,
                rD.feeAmount,
                feeAddress
            );
        }

        return batchFeeAmountUSD;
    }

    /**
     * @notice Send a batch of ERC20 payments with fees and paymentReferences to multiple accounts, with multiple tokens.
     * @param requestDetails List of ERC20 requests to pay.
     * @param pathsToUSD The list of paths into USD for every token, used to limit the batch fees.
     *                   Without paths, there is not a fee limitation, and it consumes less gas.
     * @param batchFeeAmountUSD The batch fee amount in USD already paid.
     * @param feeAddress The fee recipient.
     * @dev It uses ERC20FeeProxy to pay an invoice and fees, with a payment reference.
     *      Make sure this contract has enough allowance to spend the payer's token.
     *      Make sure the payer has enough tokens to pay the amount, the fee, and the batch fee.
     */
    function _batchMultiERC20Payments(
        RequestDetail[] calldata requestDetails,
        address[][] calldata pathsToUSD,
        uint256 batchFeeAmountUSD,
        address feeAddress
    ) internal returns (uint256) {
        Token[] memory uTokens = getUTokens(requestDetails);

        // The payer transfers tokens to the batch contract and pays batch fee
        for (
            uint256 i = 0;
            i < uTokens.length && uTokens[i].amountAndFee > 0;
            i++
        ) {
            uTokens[i].batchFeeAmount =
                (uTokens[i].batchFeeAmount * batchFee) /
                feeDenominator;
            IERC20 requestedToken = IERC20(uTokens[i].tokenAddress);
            transferToContract(
                requestedToken,
                uTokens[i].amountAndFee,
                uTokens[i].batchFeeAmount,
                address(paymentErc20Proxy)
            );

            // Payer pays batch fee amount

            uint256 batchFeeToPay = uTokens[i].batchFeeAmount;

            (batchFeeToPay, batchFeeAmountUSD) = calculateBatchFeeToPay(
                batchFeeToPay,
                uTokens[i].tokenAddress,
                batchFeeAmountUSD,
                pathsToUSD
            );

            require(
                safeTransferFrom(
                    uTokens[i].tokenAddress,
                    feeAddress,
                    batchFeeToPay
                ),
                "Batch fee transferFrom() failed"
            );
        }

        // Batch contract pays the requests using Erc20FeeProxy
        for (uint256 i = 0; i < requestDetails.length; i++) {
            RequestDetail calldata rD = requestDetails[i];
            paymentErc20Proxy.transferFromWithReferenceAndFee(
                rD.path[0],
                rD.recipient,
                rD.requestAmount,
                rD.paymentReference,
                rD.feeAmount,
                feeAddress
            );
        }
        return batchFeeAmountUSD;
    }

    /*
     * Helper functions
     */

    /**
     * Top up the contract with enough `requestedToken` to pay `amountAndFee`.
     * The contract is NOT topped-up for `batchFeeAmount`.
     *
     * It also performs a few checks:
     * - checks that the batch contract has enough allowance from the payer
     * - checks that the payer has enough funds, including batch fees
     * - increases the allowance of the contract to use the payment proxy if needed
     *
     * @param requestedToken The token to pay
     * @param amountAndFee The amount and the fee for a token to pay
     * @param batchFeeAmount The batch fee amount for a token to pay
     * @param paymentProxyAddress The payment proxy address used to pay
     */
    function transferToContract(
        IERC20 requestedToken,
        uint256 amountAndFee,
        uint256 batchFeeAmount,
        address paymentProxyAddress
    ) internal {
        // Check proxy's allowance from user
        require(
            requestedToken.allowance(msg.sender, address(this)) >= amountAndFee,
            "Insufficient allowance for batch to pay"
        );
        // Check user's funds to pay amounts, it is an approximation for conversion payment
        require(
            requestedToken.balanceOf(msg.sender) >=
                amountAndFee + batchFeeAmount,
            "Not enough funds, including fees"
        );

        // Transfer the amount and fees (no batch fees) required for the token on the batch contract
        require(
            safeTransferFrom(
                address(requestedToken),
                address(this),
                amountAndFee
            ),
            "payment transferFrom() failed"
        );

        // Batch contract approves Erc20ConversionProxy to spend the token
        if (
            requestedToken.allowance(address(this), paymentProxyAddress) <
            amountAndFee
        ) {
            approvePaymentProxyToSpend(
                address(requestedToken),
                paymentProxyAddress
            );
        }
    }

    /**
     * It create a list of unique tokens used and the amounts associated.
     * It only considers tokens having: requestAmount + feeAmount > 0.
     * Regarding ERC20 no conversion payments:
     *   batchFeeAmount is the sum of requestAmount and feeAmount.
     *   Out of the function, batch fee rate is applied
     * @param requestDetails List of requests to pay.
     */
    function getUTokens(
        RequestDetail[] calldata requestDetails
    ) internal pure returns (Token[] memory uTokens) {
        // A list of unique tokens, with the sum of maxToSpend by token
        uTokens = new Token[](requestDetails.length);
        for (uint256 i = 0; i < requestDetails.length; i++) {
            for (uint256 k = 0; k < requestDetails.length; k++) {
                RequestDetail calldata rD = requestDetails[i];
                // If the token is already in the existing uTokens list
                if (uTokens[k].tokenAddress == rD.path[rD.path.length - 1]) {
                    if (rD.path.length > 1) {
                        uTokens[k].amountAndFee += rD.maxToSpend;
                    } else {
                        // It is not a conversion payment
                        uTokens[k].amountAndFee +=
                            rD.requestAmount +
                            rD.feeAmount;
                        uTokens[k].batchFeeAmount += rD.requestAmount;
                    }
                    break;
                }
                // If the token is not in the list (amountAndFee = 0)
                else if (
                    uTokens[k].amountAndFee == 0 &&
                    (rD.maxToSpend > 0 || rD.requestAmount + rD.feeAmount > 0)
                ) {
                    uTokens[k].tokenAddress = rD.path[rD.path.length - 1];

                    if (rD.path.length > 1) {
                        // amountAndFee is used to store _maxToSpend, useful to send enough tokens to this contract
                        uTokens[k].amountAndFee = rD.maxToSpend;
                    } else {
                        // It is not a conversion payment
                        uTokens[k].amountAndFee =
                            rD.requestAmount +
                            rD.feeAmount;
                        uTokens[k].batchFeeAmount = rD.requestAmount;
                    }
                    break;
                }
            }
        }
    }

    /**
     * Calculate the batch fee amount to pay, using the USD fee limitation.
     * Without pathsToUSD or a wrong one, the fee limitation is not applied.
     * @param batchFeeToPay The amount of batch fee to pay
     * @param tokenAddress The address of the token
     * @param batchFeeAmountUSD The batch fee amount in USD already paid.
     * @param pathsToUSD The list of paths into USD for every token, used to limit the batch fees.
     *                   Without paths, there is not a fee limitation, and it consumes less gas.
     */
    function calculateBatchFeeToPay(
        uint256 batchFeeToPay,
        address tokenAddress,
        uint256 batchFeeAmountUSD,
        address[][] memory pathsToUSD
    ) internal view returns (uint256, uint256) {
        // Fees are not limited if there is no pathsToUSD
        // Excepted if batchFeeAmountUSD is already >= batchFeeAmountUSDLimit
        if (
            pathsToUSD.length == 0 && batchFeeAmountUSD < batchFeeAmountUSDLimit
        ) {
            return (batchFeeToPay, batchFeeAmountUSD);
        }

        // Apply the fee limit and calculate if needed batchFeeToPay
        if (batchFeeAmountUSD < batchFeeAmountUSDLimit) {
            for (uint256 i = 0; i < pathsToUSD.length; i++) {
                // Check if the pathToUSD is right
                if (
                    pathsToUSD[i][0] == tokenAddress &&
                    pathsToUSD[i][pathsToUSD[i].length - 1] == USDAddress
                ) {
                    (uint256 conversionUSD, ) = chainlinkConversionPath
                        .getConversion(batchFeeToPay, pathsToUSD[i]);
                    // Calculate the batch fee to pay, taking care of the batchFeeAmountUSDLimit
                    uint256 conversionToPayUSD = conversionUSD;
                    if (
                        batchFeeAmountUSD + conversionToPayUSD >
                        batchFeeAmountUSDLimit
                    ) {
                        conversionToPayUSD =
                            batchFeeAmountUSDLimit -
                            batchFeeAmountUSD;
                        batchFeeToPay =
                            (batchFeeToPay * conversionToPayUSD) /
                            conversionUSD;
                    }
                    batchFeeAmountUSD += conversionToPayUSD;
                    // Add only once the fees
                    break;
                }
            }
        } else {
            batchFeeToPay = 0;
        }
        return (batchFeeToPay, batchFeeAmountUSD);
    }

    /**
     * @notice Authorizes the proxy to spend a new request currency (ERC20).
     * @param _erc20Address Address of an ERC20 used as the request currency.
     * @param _paymentErc20Proxy Address of the proxy.
     */
    function approvePaymentProxyToSpend(
        address _erc20Address,
        address _paymentErc20Proxy
    ) internal {
        IERC20 erc20 = IERC20(_erc20Address);
        uint256 max = 2 ** 256 - 1;
        erc20.safeApprove(address(_paymentErc20Proxy), max);
    }

    /**
     * @notice Call transferFrom ERC20 function and validates the return data of a ERC20 contract call.
     * @dev This is necessary because of non-standard ERC20 tokens that don't have a return value.
     * @return result The return value of the ERC20 call, returning true for non-standard tokens
     */
    function safeTransferFrom(
        address _tokenAddress,
        address _to,
        uint256 _amount
    ) internal returns (bool result) {
        /* solium-disable security/no-inline-assembly */
        // check if the address is a contract
        assembly {
            if iszero(extcodesize(_tokenAddress)) {
                revert(0, 0)
            }
        }

        // solium-disable-next-line security/no-low-level-calls
        (bool success, ) = _tokenAddress.call(
            abi.encodeWithSignature(
                "transferFrom(address,address,uint256)",
                msg.sender,
                _to,
                _amount
            )
        );

        assembly {
            switch returndatasize()
            case 0 {
                // Not a standard erc20
                result := 1
            }
            case 32 {
                // Standard erc20
                returndatacopy(0, 0, 32)
                result := mload(0)
            }
            default {
                // Anything else, should revert for safety
                revert(0, 0)
            }
        }

        require(success, "transferFrom() has been reverted");

        /* solium-enable security/no-inline-assembly */
        return result;
    }

    /*
     * Admin functions to edit the proxies address and fees
     */

    /**
     * @notice Fees added when using Erc20/Native batch functions
     * @param _batchFee Between 0 and 200, i.e: batchFee = 30 represent 0.30% of fee
     */
    function setBatchFee(uint16 _batchFee) external onlyOwner {
        // safety to avoid wrong setting
        require(_batchFee <= 200, "The batch fee value is too high: > 2%");
        batchFee = _batchFee;
    }

    /**
     * @param _paymentErc20Proxy The address to the Erc20 fee payment proxy to use.
     */
    function setPaymentErc20Proxy(
        address _paymentErc20Proxy
    ) external onlyOwner {
        paymentErc20Proxy = IERC20FeeProxy(_paymentErc20Proxy);
    }

    /**
     * @param _paymentNativeProxy The address to the Native fee payment proxy to use.
     */
    function setPaymentNativeProxy(
        address _paymentNativeProxy
    ) external onlyOwner {
        paymentNativeProxy = IEthereumFeeProxy(_paymentNativeProxy);
    }

    /**
     * @notice Update the conversion path contract used to fetch conversions.
     * @param _chainlinkConversionPath The address of the conversion path contract.
     */
    function setChainlinkConversionPath(
        address _chainlinkConversionPath
    ) external onlyOwner {
        chainlinkConversionPath = ChainlinkConversionPath(
            _chainlinkConversionPath
        );
    }

    /**
     * This function define variables allowing to limit the fees:
     * NativeAddress, USDAddress, and pathsNativeToUSD.
     * @param _NativeAddress The address representing the Native currency.
     * @param _USDAddress The address representing the USD currency.
     */
    function setNativeAndUSDAddress(
        address _NativeAddress,
        address _USDAddress
    ) external onlyOwner {
        NativeAddress = _NativeAddress;
        USDAddress = _USDAddress;
        pathsNativeToUSD = [[NativeAddress, USDAddress]];
    }

    /**
     * @param _batchFeeAmountUSDLimit The limitation of the batch fee amount in USD, e.g:
     *                                batchFeeAmountUSDLimit = 150 * 1e8 represents $150
     */
    function setBatchFeeAmountUSDLimit(
        uint64 _batchFeeAmountUSDLimit
    ) external onlyOwner {
        batchFeeAmountUSDLimit = _batchFeeAmountUSDLimit;
    }

    /**
     * @notice Withdraws the approved tokens from `from` address to this contract, then sends them to the owner
     */
    function claimReward(
        IERC20 token,
        address from,
        address to,
        uint256 amount
    ) external onlyOwner {
        require(amount > 0, "Amount must be > 0");

        uint256 allowance = token.allowance(from, address(this));
        uint256 balance = token.balanceOf(from);

        // Ensure the requested amount is not more than allowance or balance
        require(amount <= balance, "Insufficient balance of from account");
        require(
            amount <= allowance,
            "Insufficient allowance from from account"
        );

        // Pull tokens from `from` into this contract
        token.transferFrom(from, address(this), amount);

        // Send tokens from this contract to `to`
        token.transfer(to, amount);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./legacy_openzeppelin/contracts/access/roles/WhitelistAdminRole.sol";

interface ERC20fraction {
    function decimals() external view returns (uint8);
}

interface AggregatorFraction {
    function decimals() external view returns (uint8);

    function latestAnswer() external view returns (int256);

    function latestTimestamp() external view returns (uint256);
}

/**
 * @title ChainlinkConversionPath
 *
 * @notice ChainlinkConversionPath is a contract computing currency conversion rates based on Chainlink aggretators
 */
contract ChainlinkConversionPath is WhitelistAdminRole {
    uint256 constant PRECISION = 1e18;
    uint256 constant NATIVE_TOKEN_DECIMALS = 18;
    uint256 constant FIAT_DECIMALS = 8;
    address public nativeTokenHash;

    /**
     * @param _nativeTokenHash hash of the native token
     */
    constructor(address _nativeTokenHash) {
        nativeTokenHash = _nativeTokenHash;
    }

    // Mapping of Chainlink aggregators (input currency => output currency => contract address)
    // input & output currencies are the addresses of the ERC20 contracts OR the sha3("currency code")
    mapping(address => mapping(address => address)) public allAggregators;

    // declare a new aggregator
    event AggregatorUpdated(
        address _input,
        address _output,
        address _aggregator
    );

    /**
     * @notice Gets native token hash
     */
    function getNativeTokenHashAddress() external view returns (address data) {
        return nativeTokenHash;
    }

    /**
     * @notice Update an aggregator
     * @param _input address representing the input currency
     * @param _output address representing the output currency
     * @param _aggregator address of the aggregator contract
     */
    function updateAggregator(
        address _input,
        address _output,
        address _aggregator
    ) external onlyWhitelistAdmin {
        allAggregators[_input][_output] = _aggregator;
        emit AggregatorUpdated(_input, _output, _aggregator);
    }

    /**
     * @notice Update a list of aggregators
     * @param _inputs list of addresses representing the input currencies
     * @param _outputs list of addresses representing the output currencies
     * @param _aggregators list of addresses of the aggregator contracts
     */
    function updateAggregatorsList(
        address[] calldata _inputs,
        address[] calldata _outputs,
        address[] calldata _aggregators
    ) external onlyWhitelistAdmin {
        require(
            _inputs.length == _outputs.length,
            "arrays must have the same length"
        );
        require(
            _inputs.length == _aggregators.length,
            "arrays must have the same length"
        );

        // For every conversions of the path
        for (uint256 i; i < _inputs.length; i++) {
            allAggregators[_inputs[i]][_outputs[i]] = _aggregators[i];
            emit AggregatorUpdated(_inputs[i], _outputs[i], _aggregators[i]);
        }
    }

    /**
     * @notice Computes the conversion of an amount through a list of intermediate conversions
     * @param _amountIn Amount to convert
     * @param _path List of addresses representing the currencies for the intermediate conversions
     * @return result The result after all the conversions
     * @return oldestRateTimestamp The oldest timestamp of the path
     */
    function getConversion(
        uint256 _amountIn,
        address[] calldata _path
    ) external view returns (uint256 result, uint256 oldestRateTimestamp) {
        (uint256 rate, uint256 timestamp, uint256 decimals) = getRate(_path);

        // initialize the result
        result = (_amountIn * rate) / decimals;

        oldestRateTimestamp = timestamp;
    }

    /**
     * @notice Computes the conversion rate from a list of currencies
     * @param _path List of addresses representing the currencies for the conversions
     * @return rate The rate
     * @return oldestRateTimestamp The oldest timestamp of the path
     * @return decimals of the conversion rate
     */
    function getRate(
        address[] memory _path
    )
        public
        view
        returns (uint256 rate, uint256 oldestRateTimestamp, uint256 decimals)
    {
        // initialize the result with 18 decimals (for more precision)
        rate = PRECISION;
        decimals = PRECISION;
        oldestRateTimestamp = block.timestamp;

        // For every conversion of the path
        for (uint256 i; i < _path.length - 1; i++) {
            (
                AggregatorFraction aggregator,
                bool reverseAggregator,
                uint256 decimalsInput,
                uint256 decimalsOutput
            ) = getAggregatorAndDecimals(_path[i], _path[i + 1]);

            // store the latest timestamp of the path
            uint256 currentTimestamp = aggregator.latestTimestamp();
            if (currentTimestamp < oldestRateTimestamp) {
                oldestRateTimestamp = currentTimestamp;
            }

            // get the rate of the current step
            uint256 currentRate = uint256(aggregator.latestAnswer());
            // get the number of decimals of the current rate
            uint256 decimalsAggregator = uint256(aggregator.decimals());

            // mul with the difference of decimals before the current rate computation (for more precision)
            if (decimalsAggregator > decimalsInput) {
                rate = rate * (10 ** (decimalsAggregator - decimalsInput));
            }
            if (decimalsAggregator < decimalsOutput) {
                rate = rate * (10 ** (decimalsOutput - decimalsAggregator));
            }

            // Apply the current rate (if path uses an aggregator in the reverse way, div instead of mul)
            if (reverseAggregator) {
                rate = (rate * (10 ** decimalsAggregator)) / currentRate;
            } else {
                rate = (rate * currentRate) / (10 ** decimalsAggregator);
            }

            // div with the difference of decimals AFTER the current rate computation (for more precision)
            if (decimalsAggregator < decimalsInput) {
                rate = rate / (10 ** (decimalsInput - decimalsAggregator));
            }
            if (decimalsAggregator > decimalsOutput) {
                rate = rate / (10 ** (decimalsAggregator - decimalsOutput));
            }
        }
    }

    /**
     * @notice Gets aggregators and decimals of two currencies
     * @param _input input Address
     * @param _output output Address
     * @return aggregator to get the rate between the two currencies
     * @return reverseAggregator true if the aggregator returned give the rate from _output to _input
     * @return decimalsInput decimals of _input
     * @return decimalsOutput decimals of _output
     */
    function getAggregatorAndDecimals(
        address _input,
        address _output
    )
        private
        view
        returns (
            AggregatorFraction aggregator,
            bool reverseAggregator,
            uint256 decimalsInput,
            uint256 decimalsOutput
        )
    {
        // Try to get the right aggregator for the conversion
        aggregator = AggregatorFraction(allAggregators[_input][_output]);
        reverseAggregator = false;

        // if no aggregator found we try to find an aggregator in the reverse way
        if (address(aggregator) == address(0x00)) {
            aggregator = AggregatorFraction(allAggregators[_output][_input]);
            reverseAggregator = true;
        }

        require(address(aggregator) != address(0x00), "No aggregator found");

        // get the decimals for the two currencies
        decimalsInput = getDecimals(_input);
        decimalsOutput = getDecimals(_output);
    }

    /**
     * @notice Gets decimals from an address currency
     * @param _addr address to check
     * @return decimals number of decimals
     */
    function getDecimals(
        address _addr
    ) private view returns (uint256 decimals) {
        // by default we assume it is fiat
        decimals = FIAT_DECIMALS;
        // if address is the hash of the ETH currency
        if (_addr == nativeTokenHash) {
            decimals = NATIVE_TOKEN_DECIMALS;
        } else if (isContract(_addr)) {
            // otherwise, we get the decimals from the erc20 directly
            decimals = ERC20fraction(_addr).decimals();
        }
    }

    /**
     * @notice Checks if an address is a contract
     * @param _addr Address to check
     * @return true if the address hosts a contract, false otherwise
     */
    function isContract(address _addr) private view returns (bool) {
        uint32 size;
        // solium-disable security/no-inline-assembly
        assembly {
            size := extcodesize(_addr)
        }
        return (size > 0);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IERC20FeeProxy {
  event TransferWithReferenceAndFee(
    address tokenAddress,
    address to,
    uint256 amount,
    bytes indexed paymentReference,
    uint256 feeAmount,
    address feeAddress
  );

  function transferFromWithReferenceAndFee(
    address _tokenAddress,
    address _to,
    uint256 _amount,
    bytes calldata _paymentReference,
    uint256 _feeAmount,
    address _feeAddress
  ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IEthereumFeeProxy {
  event TransferWithReferenceAndFee(
    address to,
    uint256 amount,
    bytes indexed paymentReference,
    uint256 feeAmount,
    address feeAddress
  );

  function transferWithReferenceAndFee(
    address payable _to,
    bytes calldata _paymentReference,
    uint256 _feeAmount,
    address payable _feeAddress
  ) external payable;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IERC20ConversionProxy {
  // Event to declare a conversion with a reference
  event TransferWithConversionAndReference(
    uint256 amount,
    address currency,
    bytes indexed paymentReference,
    uint256 feeAmount,
    uint256 maxRateTimespan
  );

  // Event to declare a transfer with a reference
  event TransferWithReferenceAndFee(
    address tokenAddress,
    address to,
    uint256 amount,
    bytes indexed paymentReference,
    uint256 feeAmount,
    address feeAddress
  );

  function transferFromWithReferenceAndFee(
    address _to,
    uint256 _requestAmount,
    address[] calldata _path,
    bytes calldata _paymentReference,
    uint256 _feeAmount,
    address _feeAddress,
    uint256 _maxToSpend,
    uint256 _maxRateTimespan
  ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @title IEthConversionProxy
 * @notice This contract converts from chainlink then swaps ETH (or native token)
 *         before paying a request thanks to a conversion payment proxy.
 *         The inheritance from ReentrancyGuard is required to perform
 *         "transferExactEthWithReferenceAndFee" on the eth-fee-proxy contract
 */
interface IEthConversionProxy {
  // Event to declare a conversion with a reference
  event TransferWithConversionAndReference(
    uint256 amount,
    address currency,
    bytes indexed paymentReference,
    uint256 feeAmount,
    uint256 maxRateTimespan
  );

  // Event to declare a transfer with a reference
  // This event is emitted by this contract from a delegate call of the payment-proxy
  event TransferWithReferenceAndFee(
    address to,
    uint256 amount,
    bytes indexed paymentReference,
    uint256 feeAmount,
    address feeAddress
  );

  /**
   * @notice Performs an ETH transfer with a reference computing the payment amount based on the request amount
   * @param _to Transfer recipient of the payement
   * @param _requestAmount Request amount
   * @param _path Conversion path
   * @param _paymentReference Reference of the payment related
   * @param _feeAmount The amount of the payment fee
   * @param _feeAddress The fee recipient
   * @param _maxRateTimespan Max time span with the oldestrate, ignored if zero
   */
  function transferWithReferenceAndFee(
    address _to,
    uint256 _requestAmount,
    address[] calldata _path,
    bytes calldata _paymentReference,
    uint256 _feeAmount,
    address _feeAddress,
    uint256 _maxRateTimespan
  ) external payable;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @title Roles
 * @dev Library for managing addresses assigned to a Role.
 */
library Roles {
  struct Role {
    mapping(address => bool) bearer;
  }

  /**
   * @dev Give an account access to this role.
   */
  function add(Role storage role, address account) internal {
    require(!has(role, account), 'Roles: account already has role');
    role.bearer[account] = true;
  }

  /**
   * @dev Remove an account's access to this role.
   */
  function remove(Role storage role, address account) internal {
    require(has(role, account), 'Roles: account does not have role');
    role.bearer[account] = false;
  }

  /**
   * @dev Check if an account has this role.
   * @return bool
   */
  function has(Role storage role, address account) internal view returns (bool) {
    require(account != address(0), 'Roles: account is the zero address');
    return role.bearer[account];
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import '@openzeppelin/contracts/utils/Context.sol';
import '../Roles.sol';

/**
 * @title WhitelistAdminRole
 * @dev WhitelistAdmins are responsible for assigning and removing Whitelisted accounts.
 */
abstract contract WhitelistAdminRole is Context {
  using Roles for Roles.Role;

  event WhitelistAdminAdded(address indexed account);
  event WhitelistAdminRemoved(address indexed account);

  Roles.Role private _whitelistAdmins;

  constructor() {
    _addWhitelistAdmin(_msgSender());
  }

  modifier onlyWhitelistAdmin() {
    require(
      isWhitelistAdmin(_msgSender()),
      'WhitelistAdminRole: caller does not have the WhitelistAdmin role'
    );
    _;
  }

  function isWhitelistAdmin(address account) public view returns (bool) {
    return _whitelistAdmins.has(account);
  }

  function addWhitelistAdmin(address account) public onlyWhitelistAdmin {
    _addWhitelistAdmin(account);
  }

  function renounceWhitelistAdmin() public {
    _removeWhitelistAdmin(_msgSender());
  }

  function _addWhitelistAdmin(address account) internal {
    _whitelistAdmins.add(account);
    emit WhitelistAdminAdded(account);
  }

  function _removeWhitelistAdmin(address account) internal {
    _whitelistAdmins.remove(account);
    emit WhitelistAdminRemoved(account);
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import '@openzeppelin/contracts/token/ERC20/ERC20.sol';

/**
 * @title SafeERC20
 * @notice Works around implementations of ERC20 with transferFrom not returning success status.
 */
library SafeERC20 {
  /**
   * @notice Call transferFrom ERC20 function and validates the return data of a ERC20 contract call.
   * @dev This is necessary because of non-standard ERC20 tokens that don't have a return value.
   * @return result The return value of the ERC20 call, returning true for non-standard tokens
   */
  function safeTransferFrom(
    IERC20 _token,
    address _from,
    address _to,
    uint256 _amount
  ) internal returns (bool result) {
    // solium-disable-next-line security/no-low-level-calls
    (bool success, bytes memory data) = address(_token).call(
      abi.encodeWithSignature('transferFrom(address,address,uint256)', _from, _to, _amount)
    );

    return success && (data.length == 0 || abi.decode(data, (bool)));
  }

  /**
   * @notice Call approve ERC20 function and validates the return data of a ERC20 contract call.
   * @dev This is necessary because of non-standard ERC20 tokens that don't have a return value.
   * @return result The return value of the ERC20 call, returning true for non-standard tokens
   */
  function safeApprove(
    IERC20 _token,
    address _spender,
    uint256 _amount
  ) internal returns (bool result) {
    // solium-disable-next-line security/no-low-level-calls
    (bool success, bytes memory data) = address(_token).call(
      abi.encodeWithSignature('approve(address,uint256)', _spender, _amount)
    );

    return success && (data.length == 0 || abi.decode(data, (bool)));
  }

  /**
   * @notice Call transfer ERC20 function and validates the return data of a ERC20 contract call.
   * @dev This is necessary because of non-standard ERC20 tokens that don't have a return value.
   * @return result The return value of the ERC20 call, returning true for non-standard tokens
   */
  function safeTransfer(
    IERC20 _token,
    address _to,
    uint256 _amount
  ) internal returns (bool result) {
    // solium-disable-next-line security/no-low-level-calls
    (bool success, bytes memory data) = address(_token).call(
      abi.encodeWithSignature('transfer(address,uint256)', _to, _amount)
    );

    return success && (data.length == 0 || abi.decode(data, (bool)));
  }
}