I have a few questions regarding the OAuth flow in a hypothetical context. Let’s imagine the following situation: we have a JavaScript client (React JS), a Keycloak server, and a REST API (Spring Boot). We use Keycloak to identify the user via a JWT. Once authenticated, we want to offer the user the ability to link their Google Calendar to their account. It is therefore necessary to associate the user ID (present in the Keycloak JWT subject) with the Google access tokens.