WhatsApp API integration for Windows billing, ERP and custom software.

What WhatsApp API integration means in this Windows app

Divya WhatsApp Connect exposes a local HTTP API on the customer’s Windows computer. A compatible billing app, ERP, POS system or custom desktop tool can call that local endpoint to trigger a WhatsApp message without making the operator copy text between applications.

Where local API integration is useful

• Invoices: trigger a message when an invoice is generated or marked ready.
• Payment reminders: send a pre-defined reminder from billing or accounting workflows.
• Dispatch updates: notify customers when an order or delivery moves to the next step.
• ERP events: connect a custom workflow that already runs on Windows.
• Document sharing: pass a supported local document reference together with the message request.

Example local request

The exact payload can depend on the desktop integration version, but the basic pattern is a local POST request from software running on the same PC.

POST http://127.0.0.1:3001/api/send
{
  "to": "91982••••••",
  "message": "Your invoice is ready.",
  "document": "invoice-1024.pdf"
}

Why a local API can be simpler than a cloud middleware layer

If the source application is already a Windows desktop application, keeping the integration local can reduce moving parts. You do not need a separate public webhook just to hand a message from one program on the PC to another. The Windows app handles the connection and stays available from the system tray.

QR connection and Meta Cloud API are different layers

The local API is the bridge used by your software. The actual WhatsApp connection can be QR-based or Meta Cloud API. QR Connect is unofficial and should be used cautiously; Meta Cloud API is the official WhatsApp Business Platform route. See the detailed comparison →

Integration checklist before deployment

1. Confirm the customer PC runs Windows 10 or Windows 11.
2. Install and activate Divya WhatsApp Connect on the licensed PC.
3. Choose and configure the appropriate WhatsApp connection mode.
4. Test the local API from the billing, ERP or custom application.
5. Add clear error handling so the source software can show when the messaging service is unavailable.
6. Keep message templates and automation aligned with the applicable WhatsApp/Meta rules.