NEXTAUTH_URL is the root of your application, thus should be http://localhost:3000 in your dev environment, https://example.com maybe in your production env,ZITADEL_CLIENT_ID you will get it after you have created your applicationZITADEL_CLIENT_SECRET you will also get this one after you created your application (Make sure to hit web, then codein the second step of the application stepper)ZITADEL_ISSUER is the domain of your instance. You will also see this on the detail page of your application under the urlssection.NEXTAUTH_SECRET you can set a random string yourself. This is only needed for next-auth library.

ZITADEL_CLIENT_IDZITADEL_CLIENT_SECRETZITADEL_ISSUERurlsNEXTAUTH_SECRET