Send OTP & transactional messages via API

Trigger a WhatsApp automation from your own app or server with a single POST request.

4 min read

The Developers & API tab turns any API-triggered automation into an endpoint your backend can call — perfect for OTPs, order confirmations and other transactional messages. This is a paid-plan feature.

Before you start

A Growth or Pro plan (the API trigger is gated).
An automation whose trigger is “API / Webhook”, using a Send Template node.

Generate your API key

WhatsApp → Developers & API → Generate key. The full key is shown only once — copy it and store it in your server’s secrets. It’s stored hashed, so it can’t be shown again.

Lost the key? Rotate it — the old one stops working instantly and you get a fresh one.

Copy the endpoint

Each API automation has its own URL: POST /api/whatsapp/trigger/{automationId}. Copy it from the endpoint list (also shown as an Automation ID chip in the flow builder header).

Send the request

POST with header Authorization: Bearer <key> and body {"to":"+9198…","variables":{"code":"123456"}}. The variables fill your template’s merge fields. A 200 with {"started":true} means it’s on its way.

Mind the limits

Up to 60 requests/minute per number. Keep the key server-side only — never ship it in a browser or mobile app.

Did this not solve it?

Raise a ticket — no account needed. We’ll reply by email.

Raise a ticket