Support Your Customers with WhatsApp (Generally Available)
Where: This change applies to Lightning Experience in Enterprise, Performance, Unlimited, and Developer editions. This feature is available in orgs with access to Messaging through a Digital Engagement add-on.
How: Make sure that you have a Facebook Business Manager account. Then enter Messaging in the Quick Find box, and select Messaging Settings. Click New Channel to open the guided setup flow and set up your WhatsApp channel.