Retrieve and export Zendesk Chat (Live Chat) conversation transcripts via the Chat API

Steps

1. Authenticate with an OAuth access token (a Zendesk OAuth token or a Chat-specific OAuth token) and send it as Authorization: Bearer {access_token} on every request; the legacy Zopim REST API (zopim.com/api/v2) was phased out in favor of {subdomain}.zendesk.com/api/v2/chat
2. List all chats for the account with GET /api/v2/chat/chats, or fetch a specific batch at once with GET /api/v2/chat/chats?ids={ids}
3. Fetch a single chat's full record, including its history array (the ordered transcript of events such as chat.memberjoin and chat message events), with GET /api/v2/chat/chats/{chat_id}
4. To locate chats matching criteria before pulling transcripts, use GET /api/v2/chat/chats/search?q={q} (restricted to account owner/administrator credentials)
5. For bulk or periodic transcript syncs, use the Incremental Exports endpoint to page through chats changed since a given timestamp rather than re-running search queries