Accept a payment

import express from 'express';
import { initialise } from '@prudra/core';
import {
  walletMiddleware,
  payMiddleware,
  vaultMiddleware,
} from '@prudra/express';

initialise({ apiKey: process.env.PRUDRA_API_KEY! });

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

// Register the wallet that receives payments (applies to all routes)
app.use(walletMiddleware({ walletId: process.env.BYO_WALLET_ID }));

app.post(
  '/analyse',
  payMiddleware({ price: '0.05', description: 'Document analysis' }),
  vaultMiddleware(),
  async (req, res) => {
    const { document } = req.body as { document: string };

    // req.payment is set after successful payment
    console.log('Payment received:', req.payment!.protocol, req.payment!.amount);

    // req.vault is set by vaultMiddleware
    const analysis = { wordCount: document.split(' ').length, sentiment: 'positive' };

    await req.vault!.addDocument(analysis, 'Analysis result');
    await req.vault!.seal('Analysis complete');

    res.json({
      vaultId:  req.vault!.id,
      analysis,
      payment: {
        protocol: req.payment!.protocol,
        txHash:   req.payment!.txHash,
      },
    });
  }
);

app.listen(4001);

# Without payment — returns 402 with both challenge headers
curl -i -X POST http://localhost:4001/analyse \
  -H "Content-Type: application/json" \
  -d '{"document": "This is the document to analyse."}'

# With stub payment (development only)
curl -X POST http://localhost:4001/analyse \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: stub_payment_accepted" \
  -d '{"document": "This is the document to analyse."}'

{
  "vaultId": "vlt_clx1abc123",
  "analysis": {
    "wordCount": 7,
    "sentiment": "positive"
  },
  "payment": {
    "protocol": "mpp",
    "txHash": "stub_0xabc123"
  }
}