Create a REST message and associated HTTP method to contact the Google service using the OAuth 2.0 profile.

1. Navigate to System Web Services > REST Message.
2. Click New.
3. Enter a descriptive Name.
4. In the Endpoint field, enter https://www.google.com/m8/feeds/contacts/default/full.
   By using default instead of a specific username, the Google API uses the OAuth credentials to determine which account to get information from.
5. In the Authentication tab, set the Authentication type to OAuth 2.0.
6. In the OAuth profile field, select the Google contacts OAuth profile.
7. Right-click the form header and select Save.
8. Click the Get OAuth Token related link to request an authorization token from Google using the configured client ID and secret.
9. In the Request for Permission window that appears, click Accept to grant access to your Google contacts.
   The token aquired is not directly accessible in your instance.
10. In the HTTP Methods related list, select the GET method.
11. Leave the HTTP method Authentication type as -- None -- to use the OAuth profile from the parent REST message record.
12. On the HTTP Request tab, add a new row to the HTTP Headers related list with a Name of GData - Version and a Value of 3.0.
13. Right-click the form header and select Save.
14. Click the Test related link.
    The test result should display an HTTP Status of 200, and the result of the contacts API call.