how whatsapp qr code works

It uses something like below.

  1. Whatsapp web application is opened by user via web browser.
  2. Server creates a UNIQUE token (number) and embeds that number in QR-Code
  3. Whatsapp phone application reads QR-Code and decodes token.
  4. Whatsapp phone application sends information about its current user and this newly read token to whatsapp server.
  5. Whatsapp server matches token (+ phone app user information) with web browser.
  6. It automatically authenticates user and open new web page with his/her information on it.

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