How to use the session token to obtain user info? (custom login ui)
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FHei @Ricardo Homem-Leão The session token is an opaque token and doesn't know anything about oidc. so you can't use it on the introspection endpoint. if you are building your own ui you will have to build the oidc part. https://zitadel.com/docs/guides/integrate/login-ui/oidc-standard
To build your own login ui for your own application it is not necessary to have the OIDC standard included or any additional work that has to be done.
FCan you share what you try to achieve? This would help working on an answer.