Developer API — send WhatsApp messages from your own systems

🎯 Goal

Send WhatsApp messages from your website, CRM or app, and receive events back, using a simple REST API.

🧰 What you need

Owner or admin-agent login
A developer, or a tool that can make HTTP requests (curl, Postman, your server)
An approved template for business-initiated messages

What you can do

Endpoint	What it does
`POST /messages`	Send a template, text, media or interactive message. Returns 202 with the message id; delivery is asynchronous
`GET /messages/:id`	Status: pending → sent → delivered → read, or failed with a reason
`GET /contacts`	Contacts with tags, custom fields and opt-in
`POST /contacts`	Create or update one contact by phone: name, tags to add or remove, custom fields
`GET /templates`	Approved templates you can send, with their components

Base URL: https://login.meapi.in/api/v1. Full reference: meapi.in/docs.

Steps: your first API message

Open Developer → API keys. Under Create a key, type a Name (e.g. Website orders) and choose Sends from: Default number (or channel_id), or one specific number.
Copy the key. It starts with mk_live_ and is shown once (Your new API key — copy it now, it will not be shown again). Click I’ve stored it.

Send a template to your own number:

curl https://login.meapi.in/api/v1/messages \
  -H "Authorization: Bearer mk_live_your_key" \
  -H "Content-Type: application/json" \
  -d '{"to":"+919812345678","type":"template","template":{"name":"hello_world","language":"en_US"}}'

You get 202 and a message id. Check WhatsApp, or call GET /messages/<id>.

Tabs: API keys, Webhooks and API reference (endpoints, errors and curl / PHP / Node.js examples). — Tabs: **API keys**, **Webhooks** and **API reference** (endpoints, errors and curl / PHP / Node.js examples).
**Create a key**: a **Name** and **Sends from** (the default number, or one specific number).
Your keys: name, the end of the key, number, **Last used** and created date. Revoke unused keys.

Tabs: **API keys**, **Webhooks** and **API reference** (endpoints, errors and curl / PHP / Node.js examples).
**Create a key**: a **Name** and **Sends from** (the default number, or one specific number).
Your keys: name, the end of the key, number, **Last used** and created date. Revoke unused keys.

The one rule to remember

Free-form messages (text, media, interactive) only go to people inside their 24-hour window. Otherwise the API answers 409 WINDOW_CLOSED, and you must send a template. See The 24-hour window.

What’s next

Outgoing webhooks →Get events in real time.API docs: Getting started →Code in curl, Node, PHP, Python.API docs: Send messages →Every message type.

Was this page helpful?