I have been given a task to implement auth with Okta/SAML in this project. I currently have NextAuth with a GitLab provider completely implemented.

They have only given me:
- Issuer URL
- Sign out URL
- Sign in URL
- Metadata URL

Everything I'm looking at requires a client ID and secret but they are saying I won't need those things.

Assuming they are right, how can I implement Okta/SAML with only what they have provided?