API Connector to Google BigQuery

Hi all - I’m struggling to get the API connector to work with Google Big Query API so am hoping one of you has done this before and can tell me what i’m messing up!

My connection are:

The error I’m getting when I try to initialize the call is:

Any one could help me?

Well that url ‘https://bigquery/v2’ is not a proper domain, so that at least is an issue.