Payments
Event registration platform
Paid event registration end to end: Cashfree payments with verified webhooks, QR tickets emailed on confirmation, and an admin sales dashboard.
Taking money for events sounds simple until you realise the browser lies — users close the tab mid-payment, lose signal on the success page, and double-click checkout. This platform runs paid registration from checkout to the gate, and most of the care goes into making sure a ticket exists exactly when a payment does. I co-led the build.
What it does
- Cashfree payments with verified webhooks — a registration is confirmed only when Cashfree’s HMAC-signed webhook says the payment cleared, not when the user lands on the success page.
- QR tickets — generated and emailed on confirmation, then validated at the gate with idempotent check-ins so a re-scan can’t mark someone in twice.
- An admin dashboard for live sales and attendance, with registrations synced out to Google Sheets for the organizers who live in spreadsheets.
- Magic-link login for members, so there’s no extra password to manage.
The part that matters
The payment webhook is the source of truth, not the browser. Confirmation, ticket generation, and the email all hang off the verified webhook — so a closed tab or a flaky connection never leaves someone charged without a ticket, or holding a ticket they didn’t pay for.
Anything that decides whether money changed hands belongs on the server, behind a signed webhook — never on a redirect the user’s browser might never reach.
Want something like this built?
I take on freelance backend and API work — auth, payments, media, and the security review to go with it.
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