Support for whatsapp and facebook api in websites would be very desirable.
Good day. I am not sure if you have had an answer to this question. Look at "https://faq.whatsapp.com/en/android/26000030/?category=5245251". From my java script I prepare a whatsapp message for the user to send by coding window.open("https://wa.me/" + tel + "?text=" + MsgText); The user then sends the message using his whatsapp account. Works well