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Links for the Viber chat and Whatsapp chat

Hi!
Tell me, please, which link should I write for the Viber and Whatsapp icons so that they open a chat, like Telegram (instead of dialing a phone number)?

Here is my site https://www.lovko.com.ua/
Here is my site read-only link https://preview.webflow.com/preview/lovko?utm_medium=preview_link&utm_source=designer&utm_content=lovko&preview=89ccca5c11012d203a9c615770d3f19c&mode=preview