As someone that's written some apps using official WA for Business accounts, I would strongly advise against any 3rd party tools for automating WA.

Whatsapp has some really stringent requirements on any kind of automation. E.g. Not messaging anyone automatically unless they messaged you with 24 hours, in fact, this is explicitly blocked if you use Meta's API. You have to use message templates in this case.

Also, any bots need to be verified with Meta etc.

And the TOS has gotten more strict recently, not less strict. So buyer beware here, Meta is really protective over reverse engineering WA protocol or automating it, so you can easily get yourself blocked or banned here.