Alright, let's get started with Okta. If you don't have an account yet, go ahead and create one. Then, follow these steps to set up your Okta integration:

1. In the Okta admin console, head over to the Applications tab and create a new Application Integration. Pick 'Web' as the platform and 'OpenID Connect' for the sign-on method. Configure the app to fit your needs.

2. In the 'Login redirect URIs' box, enter the base URL of the website you want to authenticate with Okta.

3. After setting up the application, Okta will give you a client ID and secret. You'll need these for the Supabase integration.

Now that your Okta app is ready, let's configure Supabase to use it for authentication.

1. Go to the Supabase dashboard and select your project.

2. Within your project, navigate to the Auth section, then the Settings tab, and finally the External OAuth Providers section.

3. Click on + Add Provider and then choose OpenID. A new form will pop up.

1. Fill out the form with the following details:

• "Provider Name": "Okta"
• "Provider ID": Give it a unique ID. This will be part of the URL when users are redirected to the Okta login page.
• "Client ID": Enter the client ID you got from Okta in step 1.
• "Secret": Enter the secret you got from Okta in step 1.
• "Redirect URI": Use the same URI you entered in Okta's 'Login redirect URIs' box in step 1.
• "Scopes": "openid email profile"
• "Authorization URL": Enter the authorization URL of your Okta app. It should look something like this: https://{yourOktaDomain}/oauth2/default/v1/authorize.
• "Token URL": Enter the token endpoint URL of your Okta app. It should look something like this: https://{yourOktaDomain}/oauth2/default/v1/token.
• "UserInfo URL": Enter the UserInfo Endpoint URL of your Okta app. It should look something like this: https://{yourOktaDomain}/oauth2/default/v1/userinfo.

Click Save.

Now, let's get your application to handle the login flow using Supabase's client library.

1. When a user wants to sign in, redirect them to the Supabase sign-in URL with the 'provider' parameter set to the Provider ID you entered in step 2. The URL should look like this: https://{yourSupabaseUrl}/auth/v1/authorize?provider={yourProviderId}.

2. After the user logs in with Okta, they'll be redirected back to your app with an authorization code in the URL. Your app should exchange this code for a token by calling supabase.auth.signIn() with the provider parameter set to 'okta' and the code parameter set to the authorization code from the URL.

Once you've done all this, your users should be able to log in using Okta. Their Okta profile will also be saved in Supabase's Users table, making management a breeze.