account-abstraction/develop/contracts/core/BaseAccount.sol

BaseAccount.sol

abstract contract BaseAccount is IAccount {
    // ...

    /**
     * Sends to the entrypoint (msg.sender) the missing funds for this transaction.
     * SubClass MAY override this method for better funds management
     * (e.g. send to the entryPoint more than the minimum required, so that in future transactions
     * it will not be required to send again).
     * @param missingAccountFunds - The minimum value this method should send the entrypoint.
     *                              This value MAY be zero, in case there is enough deposit,
     *                              or the userOp has a paymaster.
     */
    function _payPrefund(uint256 missingAccountFunds) internal virtual {
        if (missingAccountFunds != 0) {
            (bool success, ) = payable(msg.sender).call{
                value: missingAccountFunds,
                gas: type(uint256).max
            }("");
            (success);
            //ignore failure (its EntryPoint's job to verify, not account.)
        }
    }
}