fingerprintjs/flutter ? reverse-engineered prompt

Build me a Flutter plugin that lets my app identify visitors with Fingerprint Pro on Android, iPhone, and web.

I want to be able to create a client with an API key, choose the region, and then call one simple method to get back the visitor ID, event ID, risk score, and any sealed result. It should also let me pass things like a linked user ID and extra tags when I identify someone. Please include support for custom endpoints and a custom timeout too.

Make sure it works well as a real Flutter package, with the native Android, iOS, and web pieces wired up, plus a small example app that shows how to use it. If anything depends on the latest Flutter or native platform setup, use the current docs online and keep the instructions clear in the README.