Allowance Transfer

function approve(address token, address spender, uint160 amount, uint48 expiration) external

function permit(address owner, PermitSingle memory permitSingle, bytes calldata signature) external;

struct PermitSingle {
        // the permit data for a single token allowance
        PermitDetails details;
        // address permissioned on the allowed tokens
        address spender;
        // deadline on the permit signature
        uint256 sigDeadline;
    }

struct PermitDetails {
        // ERC20 token address
        address token;
        // the maximum amount allowed to spend
        uint160 amount;
        // timestamp at which a spender's token allowances become invalid
        uint48 expiration;
        // an incrementing value indexed per owner,token,and spender for each signature
        uint48 nonce;
    }

function permit(address owner, PermitBatch memory permitBatch, bytes calldata signature) external;

struct PermitBatch {
        // the permit data for multiple token allowances
        PermitDetails[] details;
        // address permissioned on the allowed tokens
        address spender;
        // deadline on the permit signature
        uint256 sigDeadline;
    }
struct PermitDetails {
        // ERC20 token address
        address token;
        // the maximum amount allowed to spend
        uint160 amount;
        // timestamp at which a spender's token allowances become invalid
        uint48 expiration;
        // an incrementing value indexed per owner,token,and spender for each signature
        uint48 nonce;
    }

function transferFrom(address from, address to, uint160 amount, address token) external;

function transferFrom(AllowanceTransferDetails[] calldata transferDetails) external;

struct AllowanceTransferDetails {
        // the owner of the token
        address from;
        // the recipient of the token
        address to;
        // the amount of the token
        uint160 amount;
        // the token to be transferred
        address token;
    }

mapping(address => mapping(address => mapping(address => PackedAllowance))) public allowance;

PackedAllowance allowanceInformation = allowance[ownerAddress][tokenAddress][spenderAddress];
uint48 nonce = allowanceInformation.nonce;