You can call our Geo Catalogue like: https://partners.api.skyscanner.net/apiservices/geo/v1.0?apikey={API-KEY}
We kindly ask you to cache the response for about a week. It doesn't change often, and it involves some heavy lifting on our side for that query.
If you don’t think you have the right permissions to do so or you are receiving any errors, please get in touch with us.