This endpoint will only lookup postcodes, it will be on /postcode it will also receive a query ?q= and it will search for postcodes only using our postcodes index on elastic. It should returns the results verbatim.
curl --location 'https://mock.apidog.com/m1/460771-0-default/postcode?q=undefined'
[ { "location_hash": "string", "postcode": "string", "country": "string" } ]