What personal data does Turnstile process and how long is it stored (GDPR question)

What is the name of the domain?

example.com

What is the issue you’re encountering

We need to be able to inform our users of Turnstile what personal data of theirs will be processed

What steps have you taken to resolve the issue?

I have scoured the community pages, contacted privacy support and looked everywhere online for a Turnstile privacy policy, but none can be found