As I kept investigating about this, I came up with an alternative:

A line of the Revolut CSV is turned into two transactions:

1. Actual expense
2. Revolut fee

an example:

2023-03-06 * "Cash ATM 3"
  Assets:Revolut:EUR                   -8.47 EUR
  Expenses:CashWithdrawal

2023-03-06 * "Fees for Cash ATM 3"
  Assets:Revolut:EUR                   -0.08 EUR
  Expenses:Revolut:Fees                 0.08 EUR 

This allows for the smart_importer to still work.

What are your thoughts, @tarioch ?

I think the split keeps it simple to work with smart importer and I don't have a better idea, let's use that.

@alvarogarcia7 do you want me to merge it like this or do you want to change it into the split transactions?

I have submitted the change in code, to add the fee as a new transaction.
thanks,

May I suggest to squash the changes, to actually lose the intermediate history?

Status:

• Passes the pre-commit in my local setup.
• Create tests for it. I don't know what's the best way to write tests here. Maybe you could please guide me?
• Not breaking compatibility: The parameter is optional. Old clients should still work
• Not breaking smart_importer. See below

I think there is now a pre-commit failure with the latest changes, if you can fix that, I think we can merge it. Honestly I keep the tests a bit limited in here (I have some real data based tests for some of the importers in my personal repo). I think it's ok not to add a test for it.