XF 2.3 Social login on WordPress and social login on XenForo, how to?

[a1omads]

I am offering user to log in and register with their Gmail at https://www.example-wordpress-theme.com now, once XenForo is installed at

https://www.example-wordpress-theme.com/community/

I don't want people to re-login or register with Gmail.

Same thing if they use Facebook login, so once login is done, members can access both services without re-login to either WordPress or XenForo forum under /community/

How can I do it?