This repository contains tutorials showing how to use Fingerprint to solve common fraud prevention and account security problems.

Each tutorial is a self-contained demo application with:

• A starter branch with the initial project setup
• A final branch with the completed Fingerprint implementation

Current tutorials:

• Account sharing prevention – Prevent account sharing across multiple devices.
• Ban evasion prevention – Prevent banned users from evading enforcement and returning under new accounts.
• Card testing prevention – Stop card testing and card cracking attacks using device intelligence.
• Chargeback dispute support – Link purchases to devices to help investigate and dispute chargebacks.
• Coupon abuse prevention – Enforce appropriate coupon usage per visitor.
• Credential stuffing prevention – Prevent credential stuffing attacks and protect against account takeover.
• Loan application fraud prevention – Collect high-quality, low-risk loan applications and prevent loan application fraud.
• New account fraud prevention – Stop multi-accounting, free trial abuse, and other new account fraud.
• Paywall enforcement – Enforce paywalls even when users clear cookies or change IP addresses.
• Regional pricing enforcement – Enforce region-based pricing and stop VPN-based pricing abuse.
• SMS pumping prevention – Prevent automated SMS pumping abuse and reduce messaging costs.
• Survey fraud prevention – Stop duplicate and fraudulent survey submissions.
• Web scraping prevention – Protect your proprietary content from being scraped by bots.

1. Clone this repo and within the use case folder of interest, run:

npm install

2. Copy or rename .env.example to .env and add your Fingerprint secret API key.

3. Start the server:

npm run dev

4. Visit http://localhost:3000 in your browser to view the demo application.

To reset the demo database for a given use case:

• Click Reset demo DB at the bottom of the demo app page, or
• Run this from the terminal:

npm run reset-db