Before you scan — please read.
Scanning a code below links your WhatsApp to this workspace as a
linked device. Whoever runs this workspace will then be able to read and send WhatsApp
messages from your number, the same as WhatsApp Web. Only scan if you were asked to and you trust them.
On your phone: WhatsApp → Settings → Linked Devices → Link a Device, then point the camera at a code.
You can remove the link any time from that same screen.