Using Postman to access OAuth 2.0 Google APIs

Question

I am trying to access Proximity Google API using Postman chrome app. I have followed tutorials on postman and google dev website but I'm still getting 401 error message.

What am I doing?

• Step 1 - Enable Proximity API:

In order to use Proximity API, it has to be first enabled in Google Dev console. Using this tutorial I have enabled support for Proximity API for my project

• Step 2 - Get the credentials:

According to this tutorial, I need to get client ID and secret. This is where I am confused. Credentials->Add credentials->OAuth2.0 client ID->select Chrome App radio button (since I am using Postman)->enter last part of Postman's Chrome Web store URL [which is fhbjgbiflinjbdggehcddcbncdddomop]->hit create button These steps will only generate a client ID, not a secret..am I doing something wrong?

From the Google Dev console, one can download an JSON file which has client id, auth URI and Token URI

I downloaded this but this is of little help if I am using Postman. I am guessing this JSON file is something that can be included in a JS application.

• Step 3 - Use Postman to test the API

What am I getting?

And, once I click on the debug URL, I see the following screen

Answer 1

Postman will query Google API impersonating a Web Application

Generate an OAuth 2.0 token:

1. Ensure that the Google APIs are enabled

2. Create an OAuth 2.0 client ID

   • Go to Google Console -> API -> OAuth consent screen
     • Add getpostman.com to the Authorized domains. Click Save.
   • Go to Google Console -> API -> Credentials
     • Click 'Create credentials' -> OAuth client ID -> Web application
       • Name: 'getpostman'
       • Authorized redirect URIs: https://www.getpostman.com/oauth2/callback
   • Copy the generated Client ID and Client secret fields for later use

3. In Postman select Authorization tab and select "OAuth 2.0" type. Click 'Get New Access Token'

   • Fill the GET NEW ACCESS TOKEN form as following
     • Token Name: 'Google OAuth getpostman'
     • Grant Type: 'Authorization Code'
     • Callback URL: https://www.getpostman.com/oauth2/callback
     • Auth URL: https://accounts.google.com/o/oauth2/auth
     • Access Token URL: https://accounts.google.com/o/oauth2/token
     • Client ID: Client ID generated in the step 2 (e.g., '123456789012-abracadabra1234546789blablabla12.apps.googleusercontent.com')
     • Client Secret: Client secret generated in the step 2 (e.g., 'ABRACADABRAus1ZMGHvq9R-L')
     • Scope: see the Google docs for the required OAuth scope (e.g., https://www.googleapis.com/auth/cloud-platform)
     • State: Empty
     • Client Authentication: "Send as Basic Auth header"
   • Click 'Request Token' and 'Use Token'
4. Set the method, parameters, and body of your request according to the Google docs