Blog: Tutorials

Articles tagged tutorials, newest first.

• Detect account takeover at login with Node.js

  2026-10-27 · Tutorials · Fraud

  Tutorial: identify the browser at login, fetch the event on your Node.js server, compare the visitor with the account’s known devices and ask for a second step.

• Verify the visitor on your server with Python

  2026-10-27 · Tutorials

  Tutorial: never trust a visitorId the browser posts. Verify the eventId on your Python backend with the events API, or open a sealed result, before you act.

• Protect a Next.js sign-up from repeat free trials

  2026-10-25 · Tutorials · Fraud

  Stop repeat sign-ups in a Next.js App Router app: mint an intent, identify the device in a client component, and decide on the server with the Node.js SDK.

• Check free-trial eligibility from a Python backend

  2026-10-25 · Tutorials · Fraud

  Decide on your Python backend whether a device may claim a free trial or coupon: create an intent, check eligibility, fail closed, and release a refunded claim.

• Receive and verify FingerPrint Checker webhooks in Go

  2026-10-25 · Tutorials

  Receive identify events in a Go service: read the raw body, verify FPC-Signature with the Go SDK, ignore duplicates, and answer fast so retries stop.