Hi Gareth,
Thanks for your suggestion. KashFlow has an open API, we invite any system to integrate with KashFlow and have our documentation ready to exchange with any party wishing to build such an integration.
If you do speak to Unleashed, please ask them to contact our support team who will get the ball rolling.
This is something we also need. After five years with Kashflow we are having to move to Xero since Kashflow refuse to support the integration. I've spoken to Unleashed who prepared to pay for the integration. Back in the day Kashflow would have invested in the integration. We also have a big problem in that we can't fully export all our sales invoices to move to Xero. The original promise of Kashflow was that you could export your data whenever you like. Sadly now this is no longer a feature they provide. The support told me the only way to do it is to manually export each customer's orders. We have over 1500 customers!