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Build WhatsApp into your product.

For developers connecting customer messages to their own app, backend or CRM.

Get my API keyOpen the setup guide
REST APIIllustrative example
POST /v1/messages
{
  "phone": "+1234567890",
  "message": "Hi Jordan! I’ll check your order with the team and send you an update."
}
201 Created
Send with the REST API and use webhooks to follow message events. A queued message is not proof of delivery.

One request. Then track what happens.

Send messages
Read conversation data
Receive webhook events

Message types depend on the number’s connection and WhatsApp rules. Use approved templates when required.

Receive webhook events

Send with the REST API and use webhooks to follow message events. A queued message is not proof of delivery.

Open the setup guide
WhatsApp → Webhookmessage:in:newmessage:out:ack

Open the setup guide

cURL
Terminal
curl -X POST https://api.wassenger.com/v1/messages \
  -H "Token: $WASSENGER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "phone": "+1234567890",
    "message": "Hello from Wassenger"
  }'
Node.js
send.js
await fetch('https://api.wassenger.com/v1/messages', {
  method: 'POST',
  headers: {
    'Token': process.env.WASSENGER_API_KEY,
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    phone: '+1234567890',
    message: 'Hello from Wassenger'
  })
})
Python
send.py
import os, requests

requests.post(
    'https://api.wassenger.com/v1/messages',
    headers={'Token': os.environ['WASSENGER_API_KEY']},
    json={
        'phone': '+1234567890',
        'message': 'Hello from Wassenger'
    }
)
PHP
send.php
$ch = curl_init('https://api.wassenger.com/v1/messages');
curl_setopt_array($ch, [
    CURLOPT_POST       => true,
    CURLOPT_HTTPHEADER => [
        'Token: ' . getenv('WASSENGER_API_KEY'),
        'Content-Type: application/json'
    ],
    CURLOPT_POSTFIELDS => json_encode([
        'phone'   => '+1234567890',
        'message' => 'Hello from Wassenger'
    ])
]);
curl_exec($ch);
API TesterIllustrative exampleOpen the setup guide
Connect WhatsApp to the tools your team already uses.MCP

Before you connect

Does an API response mean the message was delivered?
No. Creating a message confirms that it was accepted for processing, not delivered. Follow its status and delivery events with the API or webhooks.
Can I send any message type from every number?
Available message types depend on the number’s connection and WhatsApp rules. Official API numbers require approved templates in the situations defined by Meta.

Less switching tabs. More time for customers.

Connect WhatsApp to the tools your team already uses.

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