AI Agents12 min read
How to Build a WhatsApp AI Sales Bot using OpenAI, Node.js and Meta API
By Raghav Shah•
E-commerce sales never sleep. By building a WhatsApp AI bot, online stores can capture and qualify inbound buyer traffic 24 hours a day on autopilot.
Inbound support agents are slow and expensive
Customers abandon shopping checkouts if their product or sizing question goes unanswered for more than 5 minutes. Support staff cannot monitor chats 24/7.
The Solution: WhatSync Tech Architecture
A Node.js server acts as a Meta webhook listener, receives WhatsApp message events, queries product catalog vectors, and replies with precise context using OpenAI GPT-4.
Express.js WhatsApp Webhook Message Listener
// WhatsApp Webhook endpoint handler
app.post('/webhook', async (req, res) => {
const { entry } = req.body;
if (entry && entry[0].changes && entry[0].changes[0].value.messages) {
const msg = entry[0].changes[0].value.messages[0];
const userText = msg.text.body;
const aiReply = await queryAICopilot(userText, msg.from);
await sendWhatsAppMessage(msg.from, aiReply);
}
res.sendStatus(200);
});Key Insights & Takeaways
- ✓ Meta Cloud APIs deliver messages globally in milliseconds
- ✓ Vector databases store and query thousands of product SKU details
- ✓ Automated order lookup via Shopify webhooks reduces support tickets by 50%
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