Can not login with HybridAuth
A couple of things I would check. 


Make sure you're using the correct redirect URIs and JavaScript Origins. For example, the redirect URI should be https://www.example.com/coupon/hybridauth/endpoint?hauth.done=Google and the app you've registered at Google contain this too. The JavaScript Origins at Google should contain www.example.com (and example.com if you allow that too).
Since you're running the site in a subdir, make sure you've set RewriteBase in .htaccess to /coupon/. That might cause a problem with redirecting after auth.