Is there a Whatsap, Viber, Telegram chat call script for the site?

Question

whatsapp

Greetings
Are there ready-made solutions in the form of a script so that by clicking on a link on the site, a Whatsap, Viber, Telegram chat opens, depending on which messenger link the user clicked on? I know that there are sharing buttons, but they are not interested. On the network, information on this topic is scarce and I could not find anything sensible and fully working.
PS
The only thing I found was calling a chat for whatsapp, but it only works on Android:

<a href="intent://send/PHONE_NUMBER#Intent;scheme=smsto;package=com.whatsapp;action=android.intent.action.SENDTO;end">CLICK</a>

Answer 1

there is a telegram widget to display messages on the site - https://tgwidget.com/

Answer 2

For WhatsApp, there are links https://wa.me/79234567890
like this. You can even add a message like this:

https://wa.me/7923567890?text=Я%20заинтересован%20в%20покупке%20вашего%20авто

Here it is written in detail: https://faq.whatsapp.com/en/android/26000030/?lang=ru