Overview Conversations (classic) API provides persistent, multi-channel threads where participants on SMS, WhatsApp, and web chat can message together. Unlike single-message APIs, Conversations maintains history and supports multi-agent access. Note: This is the Conversations (classic) API (v1). --- Prerequisites - Twilio account with Conversations (classic) enabled — New to Twilio? See — Enable at: Console Conversations Manage Overview Enable Conversations - Environment variables: - - — See for credential setup and best practices - SDK: / - For SMS/WhatsApp participants: a Twilio number assi…