The Magento 2 WhatsApp chat extension incorporates a feature to contact the store admin on their mobile number. As soon as you enable it from the store backend and enter your default WhatsApp contact number along with a push message for making it works.
As a customer, we have tons of questions when making specific purchases online. In order to resolve these queries, they always want to get an immediate response instead of spending more time talking to customer support raising a request for assistance. At such moments, to boost the customer experience as well as increase customer trust and loyalty towards your brand; the store owners can provide instant support with the help of whatsapp chat extension.

Unnt
Very flexible and well works for my clients.