I know there is a tutorial for Integrating with Google OAuth Exercise for web but I want to know which is the current best method to achieve Google login with mobile platform in OutSystems. I am trying with google+ login but this is deprecated.

Hello Pankaj,

Following this google+ will disappear in April (here from google). Several services from Google will come to an end soon. I believe you shouldn't be using that since it will be deprecated anyway.