WhatsApp has the highest open rate and click through rate (CTR) in some country. Many country use WhatsApp more than chat tools, it is become their resource information to gather news, shopping online, send order notification, etc. People using WhatsApp to chat with seller, like asking price, sending address, make a payment confirmation, and many more. This is why you need to start using WhatsApp as powerful marketing tools.
Since August 2018, WhatsApp open its official API for WhatsApp Business Account. You need to apply first and their team will verify if you are able to use the API or no. This wil be a pain journey if you don’t understand any programming language.