WhatsApp brand icon: Font Awesome Free 6.x, Fonticons, Inc.
Source: https://github.com/FortAwesome/Font-Awesome/blob/6.x/svgs/brands/whatsapp.svg
Icons license: CC BY 4.0, https://creativecommons.org/licenses/by/4.0/
https://fontawesome.com/license/free
Trademark belongs to WhatsApp/Meta. Icon is used to identify the destination of the contact button.