QuickBooks online - Not possible to import IIF Files
With the current version of Quick Books online it is not possible to import the normal Intuit Integration File (IIF) format.
The only way to import the IIF files into Quickbooks is to use Quick Books desktop version.
You can import the CSV files into QuickBooks online however you are required to map the CSV manually each time. There is not the ability to save the mapping.
The QuickBooks desktop version does not run properly on Mac OS computers.