Fingerprint

I don't know what device you're using, but here's a library that works with some of them: https://github.com/cobisja/tad-php

I'd start by checking the zkteco website (or googling) and looking for code examples, or reaching out to them for support since you bought their product. It looks like they have a fingerprint SDK available for their devices.

There's a SDK on their website. https://www.zkteco.com/en/download_catgory.html Dont know if that will work for you