You can also include a link to a WhatsApp chat in the job advertisement.

To do this, open the job advertisement template and write the telephone number or "Start WhatsApp chat" in the desired place and link this to a previously generated link.
If the applicant has WhatsApp installed and clicks on the link, a WhatsApp chat will be opened that is already pre-filled with a message.

How the link is generated can be read for instance here: By clicking on this link, you will be redirected to a WhatsApp FAQ page.