pragma solidity 0.5.12;

interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address owner) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);

    function transfer(address to, uint256 value) external returns (bool);
    function approve(address spender, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function burn(uint256 value) external;
    function burnFrom(address from, uint256 value) external;

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function APPROVE_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint256);

    function approveMeta(
        address owner, address spender, uint256 value, uint256 nonce, uint256 expiration, uint8 v, bytes32 r, bytes32 s
    )
        external;
}