Hi,
we are desperately waiting for the upcoming public Whatsapp API ourselves.
We COULD use one of the inoffical APIs that are out there but you and us would face these issues:
- once Whatsapp finds out you are using a 3rd party API, your phone number will be blocked
- we will for sure receive a letter from their lawyers
However, Whatsapp changed its terms and conditions last year in October to prepare legally for their upcoming official bot API. As soon as this is available, you will see us jumping in.
In the meanwhile, I suggest to use our Skype plugin combined and our Telegram plugin. I'd say you can cover at least some good fraction of people then.