Design an Opencart 3.2 extension

I need an extension for Opencart that enables: Web site visitor Side to be able click on a link that will redirect him to whatsapp (web or mobile) with assigned text and related link Administration side To be able to log in whatsapp with password without QR code and make necessary communication trough the given page Given page needs to be scalable and flexible I will need to be able to add html/php script on the side of the page so for example admin can communicate with client and check his/hers order status instantly without leaving the page