How to Send a WhatsApp Message Using an API
Introduction
Sending a WhatsApp message from your own software is no longer a developer-only job. Once your number is connected, one HTTP request is enough to deliver an order update, an OTP or a reminder.
How it works
Your system talks to an API endpoint. The API keeps a live session with your WhatsApp number and passes the message on. You get back a message id, and later a delivery status for it.
Practical use cases
- Order confirmations and shipping updates
- One time passwords for login
- Invoice and payment reminders
- Appointment reminders
- Support replies from your own dashboard
- Vehicle and GPS alerts
Step by step
Connect the number by scanning the QR code once. Copy your API key from the dashboard. Send a POST request with the receiver number in full international format and the message text. Read the response for the message id.
Then watch the delivery status. A status of DEVICE means it reached the phone, READ means it was opened, and an error means the number was wrong or the session dropped.
Safety and policy notes
Only message people who expect to hear from you. Keep a gap between messages, never send the same text to a large unsaved list, and give people an easy way to opt out. This protects your number from being blocked.
Frequently Asked Questions
Do I need a business account?
No. Any WhatsApp number that can be linked to a device can be connected.
How fast are messages delivered?
Normally within a second, as long as your number stays connected and the receiver is reachable.
Can I send images and PDF files?
Yes, media messages are supported alongside plain text.
Conclusion
Connect the number, send one request, and check the delivery status. That is the whole flow.