Whatsapp + Telegram + Viber + VK + Instagram, how to integrate everything?

Question

In contact with

Tell me if it is possible to do the following:
Receive messages from instant messengers and social networks, reply to messages and integrate all this into one chat.
Do not offer third-party services, meaning whether there are APIs and technical capabilities for such integration.
For example, to implement a chat in PHP + JS and dump all messages there and from this chat to conduct correspondence ...

Answer 1

Full of integrations of all this on github
https://github.com/topics/whatsapp-api

Answer 2

As a rule, you can’t just take it and integrate everything completely without third-party software.
Here, read for inspiration: https://habr.com/en/company/reactos/blog/599777/