Overview A WhatsApp sender is a phone number registered with WhatsApp Business through Twilio. Registration goes through a lifecycle of statuses before becoming . Sandbox testing does not require a registered sender — see . --- Prerequisites - Upgraded Twilio account (trial accounts cannot register production senders) — See for signup and upgrade steps - A phone number capable of receiving SMS or voice verification - Number must not already be registered with WhatsApp - Environment variables: - - — See for credential setup and best practices - SDK: / --- Quickstart Python Node.js --- Sender L…