In many markets WhatsApp is where buying decisions actually happen. WhatsApp Business (free) turns the chat your customers already use into a professional channel.
Add a WhatsApp button to your site and Instagram. Answer fast — reply speed is the strongest trust signal on this channel. Send order updates and shipping info through it.
Broadcasts only to people who opted in, and rarely. One valuable message beats ten promotional ones.
Bottom line: fast, personal WhatsApp replies close more sales than any chatbot.