A CDN (Content Delivery Network) is a place where all types of content are hosted. Including images, audio, json files and other.
First you need to get your API token, which you can find under developers section in the User's Dashboard.
After getting your API token, you need to check the current version of the API, by parsing:
GEThttps://cdn.nextfur.net/version
After getting the version, store it to handle new requests.