If the API isn't turned on in KashFlow or you get an error requesting the API settings are updated, here's the quick steps to activate the API in KashFlow:
Log into your KashFlow account
Click the 'Apps' tab and choose 'API Settings'
Enable the API Tick, and click 'Update'
Back in AutoEntry, refresh the Integration page and click connect again
The integration should now be successful
There is some further details on this KashFlow help page if required.