Third party authentication without sign-in

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I have to implement single-sign-on similar to the way social connections work.

There are two websites XYZ- third party website(client) and ABC - my website.The users who are authenticated at XYZ should be allowed to access ABC without any password.
To achieve this I will be exchanging tokens for validating the users.

The issue lies for the first time users in ABC. I should not manually enter the user details in auth0. If the user is logging in for the first time, his details should be entered into auth0 just like google-OAuth does and not through any identity provider like database connectivity.

I checked out the custom extensions provided by auth0, but I do not have access to the user profiles of the third party clients.

I am aware of the usage of tokens. However, I am not clear if the above scenario is achievable in auth0 without the user details already available.

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As it has been more than a few months since this topic was opened, and there has been no reply or further information provided as to the existence of the issue, we are closing this topic. Please don’t hesitate to create a new topic if this issue is still present, we would be happy to work with you to help find a resolution.