How to send a message on WhatsApp?

Question

PHP

Is there a need to send messages to WhatsApp once a month or less? (I and 2 more people will decide this as messages accumulate, the option when I wanted to send is not suitable) preferably on my own behalf to 1-5 clients who are friends, but through php ( remote server (vds)) ​​how can this be implemented? (only a free solution because I can’t keep track of the balance) and is there a system that if it didn’t cancel the sending once in a while, then it happened? (or what can you tell for self-realization functionality)
on the Internet I met mentions of whatsapp.class.php but where to get it and did not find it

Answer 1

WhatsApp does not provide this. There are only solutions for business accounts.

Answer 2

For example, like this
https://habr.com/en/post/327404/
Or google Whatsapp API

Answer 3

https://faq.whatsapp.com/ru/general/26000030
UPD.:
Bad search. The first link on Google leads to GitHub .