Account Abstraction: Trying to nderstand _payPrefund Function in MinimalAccount Contract

[0xMouiz]

In the Account Abstraction, precisely in the MinimalAccount.sol code right here: https://github.com/Cyfrin/minimal-account-abstraction/blob/main/src/ethereum/MinimalAccount.sol

What's the point behind implementing this function below?

function _payPrefund(uint256 missingAccountFunds) internal {
        if (missingAccountFunds != 0) {
            (bool success,) = payable(msg.sender).call{value: missingAccountFunds, gas: type(uint256).max}("");
            (success);
        }
    }

Like, I know that this function addresses a scenario where the user doesn't have enough funds deposited within the EntryPoint contract to cover the cost of a UserOperation.

But what I don't understand is how it would be called in the case above. Because - I think - when there are no enough funds within the EntryPoint it would revert the TX or throw an error and _payPrefund wouldn't be involved in this stage. As it's not called in the scripts... 🤔

Could anyone explain that for me, please?

[EngrPips]

Hello @0xMouiz, I haven't seen this course myself so I can't really be of help right now, but @ciaranightingale will answer this as soon as they are available.

[0xMouiz]

Hey @EngrPips, good news! I read the account-abstraction library and finally found the answer to what I was looking for. 💙

[EngrPips]

I am so glad to hear this. Keep crushing it, buddy.