Reads every connected website CMS: provider, site URL, status, publish mode (draft or live), each channel's collection and field mapping (including which provider that channel publishes to), the collections and fields Mark discovered, and a suggested mapping for each unmapped channel. mediaCollections lists the media collections Mark can read (search_cms_media and save_post take any of them; a website cover takes only the collection its cover field accepts, else mediaDestination); mediaDestination is where Mark uploads a website post's Mark images when it publishes (null: Mark uploads nothing). The API key is never returned. Connecting (site URL and key) happens in the Mark app only. Related: update_website_cms, submit_post, approve_posts.