In order for Funnel to download data from Idealo, your connected account will need to have access to both Invoices and Click Statistics.
Looking at the Idealo website, you should be able to see the two tiles as follows:
If you can't see these the Invoice tile or the Click statistics tab, Funnel won't be able to fetch data. If this is the case, please verify the account permissions and/or contact your Idealo contact in order to resolve the issue. Once you have access, please reconnect the source in Funnel and it should start downloading data as expected.
If you're still having trouble, don't hesitate to contact us and we'll help you out!