Confused about ory hydra / Google Identity Platform

Question

I have a project where I need to use Google Identity Platform to store user accounts (related to application A) in GCP and ORY hydra to connect user in an application B with that same account of app A (I think like “connect with google” butoon , I must create “connect with application A” button).

I ran the docker oauth client and ory server on ports 9010, 9001 and cretated a small login , consent providers to test and I get the final step is a token.

BUT the image is still blurry to me, can you please help me understand what should be the flow, what is the clients , servers , providers regarding Application A and Application B ? and the general flow / definition I should do ?

And in Google Identity Platform , there are " Identity Providers " , should I set a “Email/Password” for Application A and “OpenID Connect” for Application B ?

Thanks in advance

EDIT :

Here is the page to include an OIDC provider, what should I put here (regarding Hydra) ?

Answer 1

You can't use Cloud Identity Platform as an IdP (Identity Provider). However, you can reuse the setup option of the projet A, in your application B

And you should have to add the application B URL as authorized domain in the OAuth consent screen page

However, all the authentication mechanism will be handle by Firebase auth and not by Hydra. It's maybe not what you want...