Integrate LinkedIn API on a classic ASP site

Project Description:
We have an existing website programmed in classic ASP (VBScript), and we're looking to integrate LinkedIn on the login page, so that users can login to the website using their LinkedIn login and invite their contacts.

1. New users must be able to create a new account on our website, using only their LinkedIn username and password.

2. Existing users on our website must be able to log in using only their LinkedIn username and password, automatically linking both accounts based on a common email address.

3. Our website must be able to extract and save the following user data, each time a user logs in using their LinkedIn username and password:

-first name
-last name
-email address
-profile picture
-location (city/area)
-country
-"Headline"
-"Summary"

4. Users must be able to invite their LinkedIn contacts to join the user on our website. Invitations may be sent through LinkedIn or through our website.