Two-way WhatsApp messaging

curl https://api.meetergo.com/webhooks \
  -H "Authorization: Bearer ak_live:..." \
  -H "x-meetergo-api-user-id: <user-uuid>" \
  -H "Content-Type: application/json" \
  -d '{ "endpoint": "https://your-app.com/wa", "eventTypes": ["whatsapp_message_received"] }'

{
  "webhookType": "whatsapp_message_received",
  "conversationId": "conv-uuid-123",
  "from": "+491234567890",
  "text": "Do you have this in size M?",
  "type": "text",
  "windowReopened": true
}

app.post('/wa', async (req, res) => {
  res.sendStatus(200) // ACK fast; do work async

  const { from, text } = req.body
  if (req.body.webhookType !== 'whatsapp_message_received') return

  // ── your logic here ──────────────────────────────────────────
  // Route to a team, look up an order, answer a business question,
  // hand off to an agent — whatever your product does.
  const reply = await decideReply(from, text)
  // ─────────────────────────────────────────────────────────────

  await sendWhatsApp({ to: from, type: 'text', text: reply })
})

async function sendWhatsApp(body) {
  const r = await fetch('https://api.meetergo.com/v4/whatsapp/messages', {
    method: 'POST',
    headers: { Authorization: `Bearer ${API_KEY}`, 'Content-Type': 'application/json' },
    body: JSON.stringify(body),
  })
  if (r.status === 403) {
    // Window closed — fall back to an approved template.
    return sendWhatsApp({
      to: body.to,
      type: 'template',
      template: { name: 'follow_up', language: 'en_US' },
    })
  }
  return r.json()
}