With Kashflow and QuickBooks they use an intermediary to pull Ebay data. KashFlow use ConnectMyApps which you’d need to licence separately. You can effectively achieve the same thing with Zapier.
It seems Ebay are rolling out Managed Payments this year and they have a brand new API that developers can use to retrieve transaction and payout information.
It may be possible for us to build a direct link to the Managed Payments API, although there is quite a bit of work needed to set that up, so we’d need to see reasonable demand.
Having a user already on the new Managed Payments platform would be a great start, so if you are in that position please PM me or @QFSupport and we can look at potentially working with you to build a feed.