SuperSend TX + Replit

Integrate SuperSend TX transactional email into this Replit project.

Docs:
- https://docs.supersendtx.com/ai/agent-skill
- https://docs.supersendtx.com/openapi.yaml
- https://docs.supersendtx.com/builders/replit
- https://docs.supersendtx.com/ai/mcp

Rules:
1. Read SUPERSENDTX_API_KEY from Replit Secrets (already configured). Never log or expose the key to the client.
2. Send with POST https://api.supersendtx.com/emails and Authorization: Bearer <key>.
3. Until domain verification and Free production unlock (both required: verified domain + payment method on file), use from "[email protected]" and send only to the SuperSend TX account email.
4. Implement server-side email for at least one flow (welcome, reset, or notification).
5. Use html and text fields; prefer supersendtx npm package on Node.

For production: verify a domain, add a payment method to unlock Free production (no charge until you upgrade), then set from to an address on that domain. Upgrade to Pro or Scale for more volume.

import express from 'express'

const app = express()
app.use(express.json())

app.post('/api/send-test', async (req, res) => {
  const apiKey = process.env.SUPERSENDTX_API_KEY
  if (!apiKey) return res.status(500).json({ error: 'Missing SUPERSENDTX_API_KEY' })

  const upstream = await fetch('https://api.supersendtx.com/emails', {
    method: 'POST',
    headers: {
      Authorization: `Bearer ${apiKey}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(req.body),
  })

  const data = await upstream.json()
  res.status(upstream.status).json(data)
})