Membership 2 Pro Integration with Single Sign-On.

We’re trying to integrate the membership 2 Pro login/registration with single sign-on. We’ve tried many alternatives – but cannot get it to work. So I’m wondering if there’s a way to extend M2Pro to allow for single sign-on.

We want:

1) Sign In/Register – either normal process or with Single Sign-On

2) For Register:

User will need to be manually approved by admin before they have access – this has been achieved with one of the “addon” provided in the forum “user activation”

This is how the sign in form looks like http://encsstaging.wpengine.com/sign-in/

This is the plugin we used for social login http://miled.github.io/wordpress-social-login/index.html

Can any expert shed some light and guidance for us to have a custom solution in place? We’ve spent a great deal of time on this and tried all possible workarounds.