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How can i get access token google developer using OAuth2.0 C#

I want to access token to call another api of google for i which i need token. I am getting the following error in JSON.


"error" : "invalid_request",
"error_description" : "Missing required parameter: scope"



Here is my code to get access token.

var client = new RestClient("https://accounts.google.com/o/oauth2/token");
var request = new RestRequest(Method.POST);
request.AddHeader("cache-control", "no-cache");
request.AddHeader("content-type", "application/x-www-form-urlencoded");
request.AddParameter("application/x-www-form-urlencoded", "grant_type=client_credentials&client_id=" + client_id + "&client_secret=" + client_secret + "", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
return response;


I just want to get access token.

1 Answer
1

At least try to pass scope parameter as error message suggests:

var scope_string = "https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.profile%20https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.email";
request.AddParameter("application/x-www-form-urlencoded", $"grant_type=client_credentials&client_id=client_id&client_secret=client_secret&scope=scope_string", ParameterType.RequestBody);


In case you receive forbidden. You need to enable Google+ API in developer console. Follow their manual (Acquiring and using an API key):

https://developers.google.com/+/web/api/rest/oauth

Before you ask for token you need to authorize using another rest service (https://accounts.google.com/o/oauth2/auth) with "&response_type=code" parameter and then use authorization code as a parameter in the token request to get token:
...?code=Authentication Code from auth&...

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