They explained it to some extent here: https://engineering.fb.com/2024/03/06/security/whatsapp-messenger-messaging-interoperability-eu/ https://engineering.fb.c

They explained it to some extent here: https://engineering.fb.com/2024/03/06/security/whatsapp-messenger-messaging-interoperability-eu/ https://engineering.fb.com/2024/03/06/security/whatsapp-mess...