End user

(Resource Owner)


OIDC Client

OIDC Provider

Selected IDP

Service option

Additional Info

Supplementary Service

(Resource Server)

1: login request

1: click login

2: redir: authorize request

2:authorize request

3: redir: auth request



7: init idp session

3: auth request


4: get session params

9: idp gui

10: idp auth

11: auth response


17: redir: authorize response

18: authorize response


12: redir: consent request

13:  consent request

15: consent gui


14: get scopes

16: consent response


19: get access token

20 userinfo request

24: login response

22: get additional info

23: userinfo response



6: idp init request

8: idp init response







Open session with

OIDC Provider

Analyze OIDC session params to determine IDP handling

Open session with IDP service

Complete session with IDP service

10: interact with

idp gui

15: interact with

consent gui

5: idp selector

5: interact with

selector gui

Close session with

OIDC Provider and

return ID Token

(hybrid flow)

Analyze OIDC session scopes


User is authenticated with OIDC Provider via selected IDP Service

IDP Service re-directs  back to OIDC Provider

User is authenticated and has given consented access to additional info

Retrieve additional info on user based on consent

Return Access Token to be used in request for additional info


21: validate access token