# Identity Validation You can allow users from a selected domain or you can configure your API to allow only valid users. Once the API returns userExists":"true" for the requested id, e.g. for email "id":"" or for phone "id":"9196576XXXX". If the user exists he will be allowed to Login to your application. ![](https://2956668860-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MiVBIrxDmPKqx322_kk%2Fuploads%2FlqHeL0KpUTExGMktPv1z%2Fimage.png?alt=media\&token=efd651ae-a565-45e5-bfa3-8593c291b2b4) ``` [{"emailID":"james@gmail.com","userExists":"true","additionalInfo":{"group":"core","role":"admin"},"id":"james@gmail.com"}, ```