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I want to implement an HTTP call to Google Cloud Platform (GCP) to generate the Authorization token. Cant find a the correct GCP documentation for the same as well.

Using the reference from below URL, I was able to generate a Authorizaton token from Postman, using postmans Authorization UI and not the HTTP call UI. https://www.vulongtran.com/how-to-use-postman-with-google-cloud-platform-apis And the call to GCP API are working using the token generated from above process.

I tried implementing the same call via HTTP POST request, but not getting expected result.

HTTP POST

URL - https://accounts.google.com/o/oauth2/token

Query param-

grant_type:authorization_code redirect_uri:https://www.getpostman.com/oauth2/callback

Authorization - Basic Auth username - password -

Headers -

scope:https://www.googleapis.com/auth/cloud-platform redirect_uri:https://www.google.com

And the response that I get is 400 bad request { "error": "invalid_request", "error_description": "Missing required parameter: code" }

2nd Try- Also tried sending the in the request BODY, like below, but the result was same. { grant_type:'authorization_code', redirect_uri:'https://www.getpostman.com/oauth2/callback' }

Response { "error": "invalid_request", "error_description": "Missing required parameter: code" }

I saw another page, where 'code' is used in the call. Dont know what language the code on that page is for. But I am unable to figure out the correct HTTP call to get the token from there as well. Google OAuth2: Required parameter is missing: grant_type

Ashish-243d
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    The first step is to launch a browser that authenticates the user. The browser calls back to your app with the `code`. I recommend reading about how an OAuth flow works so that you understand the steps. https://developers.google.com/identity/protocols/oauth2 I wrote an article that shows how using `CURL` https://www.jhanley.com/blog/google-oauth-2-0-testing-with-curl-version-2/ – John Hanley Dec 11 '22 at 18:53

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