---
title: "Ticket sales with QR check-in, built by Claude Code on Elements"
author: "@chris"
author_url: https://elements.dev/u/@chris
published: 2026-09-30T21:31:05.379Z
url: https://elements.dev/demos/ticket-sales-with-qr-check-in-built-by-claude-code-on-mzhdcsq6
kind: post
format: article
---

# Ticket sales with QR check-in, built by Claude Code on Elements

by [@chris](https://elements.dev/u/@chris) · 2026-09-30

## Description

Shows with posters and ticket types, card checkout, one QR code per ticket by email, sales per show, and a phone door check-in with a live count.

Gatestub needed guest card checkout, QR code tickets by email, a phone door page, and live ticket and check-in counts. Each of those is a part of Elements, so the agent spent its 22 minutes on the venue's night itself.

- **Live ticket counts.** Ticket types are a LiveTable. Database triggers keep sold and checked-in counts current as tickets are issued and scanned and broadcast each change, so tickets remaining and checked in versus sold update on every open screen.
- **Card checkout with just an email.** Checkout reads prices and stock under a row lock, holds the tickets and sends the fan to Stripe. Tickets are issued when the fan returns and again when Stripe's webhook arrives, once either way. Until a Stripe key is set, the pay button opens a test checkout inside the app that records the payment through the same function, so tickets and emails work from the start. With one secret key it goes to Stripe, and in production the app registers its own webhook on the first checkout.
- **Ticket emails from a job.** Issuing tickets schedules a job in the same transaction, and it emails one QR code per ticket, inline and as an attachment.
- **Door check-in.** Door staff scan a QR code with the phone's camera or search by name, and an `@rpc` function admits each ticket once and answers valid, already checked in or not found.
- **Sessions and roles.** Admin and door accounts sign in to their own pages, and admins create shows and see sales per show.
- **Data from SQL files.** Migrations define the schema and seed four upcoming shows with drawn posters and sales, plus tonight's show with 141 of 230 checked in. The project server applied each one as soon as it was saved.