PackedUserOperation

*A https://github.com/ethereum/ercs/blob/master/ERCS/erc-4337.md#useroperation[user operation] is composed of the following elements:

• sender (address): The account making the operation
• nonce (uint256): Anti-replay parameter (see “Semi-abstracted Nonce Support” )
• factory (address): account factory, only for new accounts
• factoryData (bytes): data for account factory (only if account factory exists)
• callData (bytes): The data to pass to the sender during the main execution call
• callGasLimit (uint256): The amount of gas to allocate the main execution call
• verificationGasLimit (uint256): The amount of gas to allocate for the verification step
• preVerificationGas (uint256): Extra gas to pay the bundler
• maxFeePerGas (uint256): Maximum fee per gas (similar to EIP-1559 max_fee_per_gas)
• maxPriorityFeePerGas (uint256): Maximum priority fee per gas (similar to EIP-1559 max_priority_fee_per_gas)
• paymaster (address): Address of paymaster contract, (or empty, if account pays for itself)
• paymasterVerificationGasLimit (uint256): The amount of gas to allocate for the paymaster validation code
• paymasterPostOpGasLimit (uint256): The amount of gas to allocate for the paymaster post-operation code
• paymasterData (bytes): Data for paymaster (only if paymaster exists)
• signature (bytes): Data passed into the account to verify authorization When passed to on-chain contracts, the following packed version is used.
• sender (address)
• nonce (uint256)
• initCode (bytes): concatenation of factory address and factoryData (or empty)
• callData (bytes)
• accountGasLimits (bytes32): concatenation of verificationGas (16 bytes) and callGas (16 bytes)
• preVerificationGas (uint256)
• gasFees (bytes32): concatenation of maxPriorityFeePerGas (16 bytes) and maxFeePerGas (16 bytes)
• paymasterAndData (bytes): concatenation of paymaster fields (or empty)
• signature (bytes)*

struct PackedUserOperation {
    address sender;
    uint256 nonce;
    bytes initCode;
    bytes callData;
    bytes32 accountGasLimits;
    uint256 preVerificationGas;
    bytes32 gasFees;
    bytes paymasterAndData;
    bytes signature;
}