Viber offers REST API for that - https://developers.viber.com/
There are some libraries for whatsapp as well like
https://github.com/mgp25/Chat-API
But you will have to write the code.
Viber offers REST API for that - https://developers.viber.com/
There are some libraries for whatsapp as well like
https://github.com/mgp25/Chat-API
But you will have to write the code.