API Queries

I’m struggling trying to build out the URL for an API query:

URL structure is the following: https://api.getAddress.io/find/{postcode}

I have read through the API Connector components, how to use and connect REST/Curl API’s guide and I notice it mentions two ways of passing query parameters - either directly adding them to the url as values only (which looks like what I need to do) or as named query parameters.

Just can’t seem to figure out how to append to URL. I’ve tried both API data source and API action.

Thanks again!