Twilio has a WhatsApp integration. It's paid per message, but it's pretty cheap if you're just forwarding a single user's messages. Probably a bit expensive t

Twilio has a WhatsApp integration. It's paid per message, but it's pretty cheap if you're just forwarding a single user's messages. Probably a bit expensive to do at scale though. I'm not sure what kind of open source apps leverage it, but I would guess there is something.