[keycloak-user] Adding custom user claims after login

[Paolo Tedesco]

Hi all,

I would need to add dynamically some custom client-specific claims to a user's token after authentication.
The basic idea is that I would need to call an external application, asking for the custom claims for the authenticated user for the target client.
If I've understood correctly, I cannot do this with mappers, and I could not find a custom SPI type that fits this purpose.
Is there a way to do this with Keycloak?

Thanks,
Paolo