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

User · Answer

Postman will query Google API impersonating a Web Application

Generate an OAuth 2.0 token:

Ensure that the Google APIs are enabled
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
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'
Set the method, parameters, and body of your request according to the Google docs

User · Answer

The best way I found so far is to go to the Oauth playground here  https   developers google com oauthplayground    Select the relevant google api category  and then select the scope inside that category in the UI  Get the authorization code by clicking  authorize API  blue button  Exchange authorization code for token by clicking the blue button  Store the OAuth2 token and use it as shown below    In the HTTP header for the REST API request  add   Authorization  Bearer    Here  Authorization is the key  and  Bearer    For example   Authorization  Bearer za29 KluqA3vRtZChWfJDabcdefghijklmnopqrstuvwxyz6nAZ0y6ElzDT3yH3MT5

User · Answer

The current answer is outdated  Here s the up-to-date flow   The approach outlined here still works  10 12 2020  as confirmed by alexwhan   We will use the YouTube Data API for our example  Make changes accordingly   Make sure you have enabled your desired API for your project   Create the OAuth 2 0 Client  Visit https   console cloud google com apis credentials Click on CREATE CREDENTIALS Select OAuth client ID For Application Type choose Web Application Add a name Add following URI for Authorized redirect URIs  https   oauth pstmn io v1 callback   Click Save Click on the OAuth client you just generated In the Topbar click on DOWNLOAD JSON and save the file somewhere on your machine    We will use the file later to authenticate Postman   Authorize Postman via OAuth 2 0 Client  In the Auth tab under TYPE choose OAuth 2 0 For Access Token enter the Access Token found inside the client secret  YourClientID  json file we downloaded in step 9 Click on Get New Access Token Make sure your settings are as follows   Click here to see the settings  You can find everything else you need in your  json file    Click on Request Token A new browser tab window will open Once the browser tab opens  login via the appropriate Google account Accept the consent screen Done   Ignore the browser message  quot Not safe quot  etc  This will be shown until your app has been screened by Google officials  In this case it will always be shown since Postman is the app

User · Answer

go to https   console developers google com apis credentials create web application credentials    Postman API Access   use these settings with oauth2 in Postman    Auth URL   https   accounts google com o oauth2 auth Access Token URL   https   accounts google com o oauth2 token   Choose Scope for the HTTP API  Generate Token to add Schema use      SCOPE   https    www googleapis com auth admin directory userschema   post https    www googleapis com admin directory v1 customer customer-id schemas       fields                  fieldName    role          fieldType    STRING          multiValued   true         readAccessType    ADMINS AND SELF                schemaName    SAML       to patch user use    SCOPE   https   www googleapis com auth admin directory user  PATCH https   www googleapis com admin directory v1 users admin email com        customSchemas           SAML             role                           value    arn aws iam  123456789123 role Admin arn aws iam  123456789123 saml-provider GoogleApps              customType    Admin

User · Answer

I figured out that I was not generating Credentials for the right app type  If you re using Postman to test Google oAuth 2 APIs  select   Credentials -  Add credentials -  OAuth2 0 client ID -  Web Application

User · Answer

This is an old question  but it has no chosen answer  and I just solved this problem myself  Here s my solution    Make sure you are set up to work with your Google API in the first place  See Google s list of prerequisites  I was working with Google My Business  so I also went through it s Get Started process  In the OAuth 2 0 playground  Step 1 requires you to select which API you want to authenticate  Select or input as applicable for your case  in my case for Google My Business  I had to input https   www googleapis com auth plus business manage into the  Input your own scopes  input field   Note  this is the same as what s described in step 6 of the  Make a simple HTTP request  section of the Get Started guide  Assuming successful authentication  you should get an  Access token  returned in the  Step 1 s result  step in the OAuth playground  Copy this token to your clipboard  Open Postman and open whichever collection you want as necessary  In Postman  make sure  GET  is selected as the request type  and click on the  Authorization  tab below the request type drop-down  In the Authorization  TYPE  dropdown menu  select  Bearer Token  Paste your previously copied  Access Token  which you copied from the OAuth playground into the  Token  field which displays in Postman  Almost there  To test if things work  put https   mybusiness googleapis com v4 accounts  into the main URL input bar in Postman and click the send button  You should get a JSON list of accounts back in the response that looks something like the following           accounts                            name    accounts REDACTED                accountName    REDACTED                type    PERSONAL                state                      status    UNVERIFIED                                                  name    accounts REDACTED                accountName    REDACTED                type    LOCATION GROUP                role    OWNER                state                      status    UNVERIFIED                              permissionLevel    OWNER LEVEL

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