https://getbutton.io/
script gni
<!-- GetButton.io widget -<script type="text/javascript">
(function () {
var options = {
whatsapp: "+13456789878", // WhatsApp number
call_to_action: "hubungi aquu", // Call to action
button_color: "#FF6550", // Color of button
position: "right", // Position may be 'right' or 'left'
pre_filled_message: "isi apa gitu", // WhatsApp pre-filled message
};
var proto = 'https:', host = "getbutton.io", url = proto + '//static.' + host;
var s = document.createElement('script'); s.type = 'text/javascript'; s.async = true; s.src = url + '/widget-send-button/js/init.js';
s.onload = function () { WhWidgetSendButton.init(host, proto, options); };
var x = document.getElementsByTagName('script')[0]; x.parentNode.insertBefore(s, x);
})();
</script>
<!-- /GetButton.io widget -
https://zonainternetku.blogspot.com/2018/11/membuat-live-chat-whatsapp-di-website.html
https://www.editblogtema.com/2018/09/cara-mudah-membuat-tombol-widget.html
https://codepen.io/sundaku/pen/ZEYJEJN
https://www.igniel.com/2017/12/tombol-chat-langsung-ke-aplikasi.html