Overview

WhatsApp is one channel in Twilio's Messaging platform. All channels share the same messages.create() API — see twilio-messaging-overview for the full channel comparison and onboarding sequence.

Twilio routes WhatsApp through the Programmable Messaging API — all numbers use whatsapp:+E.164 prefix. Two sending modes apply: free-form (within 24 hrs of last inbound) and template (anytime). Sending free-form outside the window causes silent delivery failure — always check which mode is required.

Mode	When allowed	Parameters
Free-form	Within 24 hrs of last inbound from user	`body`, optional `mediaUrl`
Template	Anytime	`contentSid` + `contentVariables`

Prerequisites

Installs

Repository

twilio/ai

GitHub Stars

First Seen

May 13, 2026

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