[keycloak-user] Distinguish between Existing user login and new registration

[Kalinga Dissanayake]

Hi guys,
 
Is there an easy to way to distinguish between  a JWT token received after a brand new user registration or an existing user login?
Basically in my use case the client will be given the responsibility to update roles if its a brand new user registration or deny access if its an existing user. Is there an easy way to distinguish between the two.
 
Thanks.
 
Kalinga
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