We need to create one setting for enabling/disabling federated properties, and one setting for the MediaWiki script URL.
So for example "https://www.wikidata.org/w/", in the future we might want to change or expand this, but for now this is all that we will require.
This takes into account the fact that we will need to access the action API, as well as perform links to the UI of the remote wikibase.