Integrate whatsapp with service manager 9.64

Hi Experts,

We have a requirement to integrate Whatsapp with Service Manger, either using the Chat function of SM or as a direct link, so Engineer can chat with User using his mobile number and chat should be saved in the activity or the record, once user reply chat history is saved on the ticket.

Enviornment, SM 9.64 with Chat implemented for ESS & index users.

Pls share if any one has done same or share your ideas how to achieve this fucntion.