Hi there, if you use this url: " https://api.whatsapp.com/send?phone=&text= " then the link/message you want to share this should do it.
Got it working on my site: www.nettle.me
Code example:
$w(" #button16 ").link = " https://api.whatsapp.com/send?phone=&text="+"https://nettle.me/?rc=4120c&rn=Edley "