WhatsApp Login/Bind Flow

WhatsApp Login Flow (Simplified)

1. User Scans QR Code → Opens WhatsApp with a pre-filled message (e.g., LOGIN 123ABC).
2. Message Sent to Twilio → Your backend receives it via webhook.
3. Backend Validates & Logs In:
   • Checks session ID (123ABC)
   • Creates Firebase user (if new)
   • Generates a Firebase Custom Token
4. Website Detects Login → Uses the token to auto-sign-in via Firebase Auth.
5. User Logged In!

Tech Used:

• Twilio (WhatsApp API)
• Firebase Auth (Custom Tokens)
• Backend (Node.js/Python/etc.)

Works? Yes! Test with Twilio’s sandbox first. 🚀