I've seen that many people struggle with WABA (WhatsApp API) but they don't manage to automate it so well on n8n/MAKE.
WAMM already has a native mode on n8n (n8n-nodes-wamm) and MAKE (search WAMM).
There is also a free account where you can do tests in peace. If you want, I'll answer any questions you have.
(in the image, a flow that can be done in 1 minute - personal whatsapp assistant)