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Taking into account a site based on Wordpress and a management system that runs in the same domain, but with totally independent authentication features, I think to integrate the authentication of Wordpress with the management system, ie when logging in by Wordpress, I will automatically access the management system through a link in the Wordpress menu itself.
My need is to have user data available in the management system, such as id, name, surname among others.
If a user tries to access some restricted internal management system page without authenticating, the system should redirect him to Wordpress authentication.
I would like ideas for this integration and ideas for technical implementation.
Have you thought about authentication per service (Google, Facebook, Yahoo, Openid...)? It is practical because it would be enough for you to consume the respective Apis and secure as much as the developers of these solutions can provide.
– Bruno Augusto