Hello @AjeetV ,
Based on the example provided, it's a way of using the WhatsApp API in link form to function in a mobile device. Essentially, you'd just set up a bit of text, an image (such as in the example), or a button. From my understanding, the link to go directly to messaging you through WhatsApp should be: https://api.whatsapp.com/send?phone= , then add your WA phone number with the country code after the = sign.
A basic example of a button link would have this kind of setup:
---
I've also found some sources that say you can find a way to "share" your profile through the following process:
Open WhatsApp
Menu > Settings > Account > Email & Contacts.
Your account URL will be listed next to "WhatsApp Web."
---
Based on the example you provided, the first option would be what you're looking for. However I don't use WhatsApp, and I was having trouble finding any official support info on this directly from WhatsApp support, so you may need to experiment a bit to find what works best for your needs.
See also:
Text links
Image links
Button links
... View more