Request an 8-char pairing code to link via phone number (alternative to QR)
POST/api/sessions/:sessionId/pairing-code
Request an 8-char pairing code to link via phone number (alternative to QR)
Request
Responses
- 201
- 400
- 404
- 409
Pairing code generated
Session not started or already authenticated
Session not found
The session is not connected — an engine exists for it but is not ready: disconnected, reconnecting, or still initializing, so the request never reached WhatsApp. Wait for ready and retry. A session that was never started answers 400 instead, and the session lifecycle routes answer 409 for a conflicting state rather than this. One window answers this while the session still reads ready: WhatsApp Web periodically reloads its own page and the engine re-injects into it — for those few seconds the answer is a 409 naming the reload; retry shortly.