Google Drive access authenticated user data
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i have a scene where i need to access data from authenticated user's Drive. in my website i have a link to **Connect to Google Drive** once a user will click on the link we will authenticate user and access data from users drive.

> i am able to authenticate user an i have a redirect url, when it redirects it produce url link

    http://apps.example.com/demo/?code=4/ujkisZloix6a9HbXUsHvNj-Z8a0cw.4152lkoh0Jzz0RgrKXntQAax3ancbdI

now how to access user data ?
Please help