You’re correct, it is not a public API. In fact, just to see the specs, you need to be either an organization (or an indie developer) registered in the EU and have to sign a massive NDA just to get the documentation!
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Cake day: September 29th, 2023
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WhatsApp was originally built on, and still is, a forked version of XMPP. It is nothing like the matrix protocol.


I understand the DMA interop thing quite well, and it is a private API. The matrix bridge does not use official interop as the Matrix foundation has given up on plans to do interop, as it requires geolocating (and then georestricting) their users.
The current, longstanding, matrix bridge requires you to have the WhatsApp app installed on your phone, with a working account.