Is there a whatsapp authentication like Google, Facebook and many others does. I need to authenticate a user using there whatsapp number. More over all, it is all about getting whatsapp number of a user.
NO, you can't Whatsapp has not exposed any authentication API.
There are only two ways to integrate with WhatsApp: - Through a custom URL scheme - Through Android's intent system.
Check I'm an Android developer, how can I integrate WhatsApp with my app?