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Sign in to iPortal and create or open a service provider. The implementation guide says API credentials are obtained when creating a service provider, and these credentials are used for the Service API. Use the service provider's api_key and secret values in request bodies for /claim/* endpoints.

Sign in to iPortal and create or open a service provider. The API reference says the basicAuth credentials are obtained via iPortal as an OAuth username and OAuth password, and the implementation guide maps them to POST /{api_key}/access_token. Use them as HTTP Basic auth when exchanging for an OAuth bearer token.

First obtain OAuth username/password from iPortal for your service provider. Then call the documented token endpoint POST /{api_key}/access_token using HTTP Basic auth to obtain an OAuth 2 bearer token. Use that bearer token for the Management and User API endpoints.

Sign in to iPortal and go to the OIDC Web application registration flow described in Registering Your Application. Create an application, choose a token endpoint authentication method, and iPortal provisions your client_id and any associated secret or key-based configuration. This client registration is then used for OIDC Web login flows and the hosted-profile user-management API.