Getting the id of the user's VKontakte page by phone number?

Question

In contact with

Hello, I came across an interesting feature

. I called the company, made an order, and a minute later a Vkontakte message about the order was received, while I did not give them information from VK.

How does it work?

I looked all over the API, there is no such information

Answer 1

Those. VK support answered
It is impossible to get an ID by number
Messages are sent exclusively, the company does not receive contact information, only the message sending status (Delivered, Not delivered)
This service is paid and it is available only for confirmed groups
Here is the https://notify.mail service itself. en/