With the themes feature we can choose a brand for each OIDC client using IBM SV. We want to reuse one client for 2 brands, and we cant do it right now. We would like to have a way for a client to specify which theme to show to a user. We would need first to configure all the themes allowed for that OIDC client, and set one as default. The default will be used if no themeId is sent to the authorization endpoint. Then we should be able to pass the themeId to use as a parameter. To keep the standard, we could use the login_hint parameter for this. But we should define a format (for example we use a json right now) so we can send the themeid and the rest of the information we need to customize the UX in the same parameter.
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