Event Registration Platform
NEET CON 2026
End-to-end event registration with payments, WhatsApp delivery, and QR check-in for a national conference.
Overview
Problem
A national conference needed reliable payment collection, automatic confirmation delivery, and fast attendee verification at the door.
Solution
A self-serve platform: attendees register and pay online, get an automatic WhatsApp confirmation with a QR pass, and staff scan passes at check-in from a live admin dashboard.
Architecture
Client
Public registration flow + staff-facing admin dashboard, both Next.js.
Payments
HDFC SmartGateway integration handling collection and verification.
Messaging
Meta WhatsApp Business API sending confirmations and passes.
Data
Registration, payment, and check-in records with admin-facing aggregates.
Feature Breakdown
- Self-serve registration with HDFC SmartGateway payment collection
- Automated WhatsApp confirmation and QR pass delivery on payment success
- QR-based check-in scanning with a live admin dashboard
Implementation Detail
export async function handlePaymentWebhook(payload: WebhookPayload) {
const registration = await verifyAndFetchRegistration(payload);
if (registration.passIssued) return; // idempotent — already handled
const qr = await generateSignedQr(registration.id);
await sendWhatsAppPass(registration.phone, qr);
await markPassIssued(registration.id);
}Challenge & Solution
Payment and pass delivery had to be reliable even with late or duplicate webhooks, and check-in needed to be fast with no manual lookups.
Built idempotent webhook handling with retry-safe pass generation, and bound each QR code to a server-side lookup so scanning is a single validated read.
Results
- Zero manual steps between a payment and pass delivery.
- Check-in became a single scan per attendee instead of a manual list lookup.