Create const express = require('express'); const bodyParser = require('body-parser'); const { Pool } = require('pg'); const Redis = require('ioredis'); const fetch = require('node-fetch'); const pool = new Pool({ connectionString: process.env.DATABASE_URL || 'postgresql://localhost/integral' }); const redis = new Redis(process.env.REDIS_URL || 'redis://localhost:6379'); const app = express(); app.use(bodyParser.json()); redis.subscribe('payouts:created', () => console.log('listening for payouts')); redis.on('message', async (channel, msg) => { if (channel !== 'payouts:created') return; const { payoutId } = JSON.parse(msg); console.log('handle payout', payoutId); // naive: call settle endpoint try { await settlePayout(payoutId); } catch (err) { console.error(err); } }); async function settlePayout(payoutId) { // fetch payout const r = await pool.query('SELECT * FROM payouts WHERE id=$1 FOR UPDATE', [payoutId]); if (r.rowCount === 0) throw new Error('payout not found'); const payout = r.rows[0]; if (payout.status !== 'created') return; // mark queued await pool.query('UPDATE payouts SET status=$1 WHERE id=$2', ['processing', payoutId]); // Example: call external TMS / Accounting system / Payment Gateway // This is a stub — replace with real API call (e.g. TMS settlement API, or bank transfer). const remote = await fakePaymentGateway(payout); if (remote.success) { const txRef = remote.txRef; await pool.query('UPDATE payouts SET status=$1, tx_ref=$2, settled_at=now() WHERE id=$3', ['settled', txRef, payoutId]); await redis.publish('payouts:settled', JSON.stringify({ payoutId, txRef })); } else { await pool.query('UPDATE payouts SET status=$1 WHERE id=$2', ['failed', payoutId]); await redis.publish('payouts:failed', JSON.stringify({ payoutId })); } } async function fakePaymentGateway(payout) { // fake delay await new Promise(r => setTimeout(r, 600)); return { success: true, txRef: `TX-${Date.now()}-${Math.floor(Math.random()*1000)}` }; } app.post('/settle/:payoutId', async (req, res) => { try { const { payoutId } = req.params; await settlePayout(payoutId); res.json({ success: true }); } catch (err) { console.error(err); res.status(500).json({ success: false, error: err.message }); } }); app.listen(process.env.PORT || 3010, () => console.log('billing-service listening 3010'));