WhatsApp Voice Bot Tutorial

// server.js
const express = require('express');
const axios = require('axios');
const app = express();

app.use(express.json());

// WhatsApp webhook verification
app.get('/webhook', (req, res) => {
  const verify_token = process.env.WEBHOOK_VERIFY_TOKEN;
  
  if (req.query['hub.verify_token'] === verify_token) {
    res.send(req.query['hub.challenge']);
  } else {
    res.sendStatus(403);
  }
});

// Handle incoming messages
app.post('/webhook', async (req, res) => {
  const { entry } = req.body;
  
  if (entry?.[0]?.changes?.[0]?.value?.messages) {
    const message = entry[0].changes[0].value.messages[0];
    const from = message.from;
    const text = message.text?.body;
    
    if (text) {
      // Process message and send voice response
      await handleMessage(from, text);
    }
  }
  
  res.sendStatus(200);
});

async function handleMessage(phoneNumber, userMessage) {
  // Generate response text (you can use AI here)
  const responseText = generateResponse(userMessage);
  
  // Convert to speech using Uplift AI
  const audioUrl = await generateVoiceMessage(responseText);
  
  // Send audio to WhatsApp
  await sendWhatsAppAudio(phoneNumber, audioUrl);
}

async function generateVoiceMessage(text) {
  const response = await axios.post(
    'https://api.upliftai.org/v1/synthesis/text-to-speech-async',
    {
      voiceId: 'v_8eelc901',
      text: text,
      outputFormat: 'MP3_22050_64' // Optimized for WhatsApp
    },
    {
      headers: {
        'Authorization': `Bearer ${process.env.UPLIFT_API_KEY}`,
        'Content-Type': 'application/json'
      }
    }
  );
  
  const { mediaId, token } = response.data;
  return `https://api.upliftai.org/v1/synthesis/stream-audio/${mediaId}?token=${token}`;
}

async function sendWhatsAppAudio(to, audioUrl) {
  await axios.post(
    `https://graph.facebook.com/v17.0/${process.env.PHONE_NUMBER_ID}/messages`,
    {
      messaging_product: 'whatsapp',
      to: to,
      type: 'audio',
      audio: {
        link: audioUrl
      }
    },
    {
      headers: {
        'Authorization': `Bearer ${process.env.WHATSAPP_ACCESS_TOKEN}`,
        'Content-Type': 'application/json'
      }
    }
  );
}

function generateResponse(userMessage) {
  // Simple response logic (replace with AI)
  const responses = {
    'hello': 'السلام علیکم! میں آپ کی کیسے مدد کر سکتی ہوں؟',
    'help': 'میں یہاں آپ کی مدد کے لیے ہوں۔ آپ کوئی بھی سوال پوچھ سکتے ہیں۔',
    'default': 'آپ کا پیغام موصول ہوا۔ جلد ہی جواب دیا جائے گا۔'
  };
  
  const key = userMessage.toLowerCase();
  return responses[key] || responses.default;
}

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`Webhook server running on port ${PORT}`);
});

# WhatsApp Configuration
WHATSAPP_ACCESS_TOKEN=your_whatsapp_token
PHONE_NUMBER_ID=your_phone_number_id
WEBHOOK_VERIFY_TOKEN=your_custom_verify_token

# Uplift AI Configuration
UPLIFT_API_KEY=sk_api_your_uplift_key

# Server Configuration
PORT=3000

# Install ngrok
npm install -g ngrok

# Start your server
node server.js

# In another terminal, expose it
ngrok http 3000

# Use the HTTPS URL for WhatsApp webhook