You will need to exchange your code for a token in order to import your Gmail address book. To do this, you will need to visit the Google Developers Console and create a new project. Once you have created your project, you will need to go to the APIs & auth section and select the APIs you want to use. In this case, you will want to select the Contacts API. After you have enabled the API, you will need to create a new client ID. Once you have done this, you will be given a client ID and a client secret. You will then need to use these two pieces of information to generate a token. To do this, you will need to visit the Google OAuth 2.0 Playground and select your newly created client ID. After you have done this, you will need to select the "Get access token" button and then select the "Exchange authorization code for tokens" button. This will generate a token for you to use.
