API for working with Viber. Have experience?

Question

API

Good afternoon, there is a need to work with Viber, namely:
1. Check for a Viber account for a contact
2. Send messages to contacts
3. Check the status of sent messages
There is no open API. There are no open libraries.
Perhaps, someone faced on duty with the same need?
Or is there an understanding of what can be done about it? Is it possible to reverse engineer the protocol and draw a lib?
Perhaps someone still found some ways to work?
Also, if you are able to do this, then please contact me - write in a personal, there will be an offer.
UPDATE 2017 Viber REST API - for chatbot

Answer 1

Viber does not have a public API. Only closed, only very large companies can access it. As far as I know, LiqPay was the first in the CIS to do this. Now the agreement has also been signed by one large Ukrainian company dealing with SMS traffic. But the terms of this agreement strictly prohibit sending anything other than technical, service messages, such as passwords, notifications, etc. No ads.
The API can only be from some companies that have written their software for sending via Viber and have implemented the API for this software.

Answer 2

They probably have access to the API under some kind of agreement. Checked that by phone number. online status and put a message in viber instead of SMS. I accidentally discovered this function in liqpay too, so when I left viber, the code didn’t come anywhere at all.

Answer 3

There is already an API, but they give it on request, and only if you specify, then you send more than 60k messages per month:
www.viber.com/ru/viber-for-business

Answer 4

Today I made a payment through Liqpay. To authorize the payment, you had to enter a code. The most amazing thing is that this code came to me in viber. How did they do it?
UPD: omisms.ru - they can send messages to Viber and whatsapp. You can try directly from the site. Here's how they do it, at least in which direction to dig.