I want to develop a console application that pulls all campaigns under adwords accounts using Google Ads Api. But I could not pass the authentication step.

I do not fully understand whether I should use the Service Account or Desktop Application Flow for this process.

GoogleAdsConfig config = new GoogleAdsConfig()             {                 DeveloperToken = "Dev_token",                 OAuth2Mode = Google.Ads.GoogleAds.Config.OAuth2Flow.APPLICATION,                 OAuth2ClientId = "client_Id",                 OAuth2ClientSecret = "secrret",                 OAuth2RefreshToken = " refresh_token",              }; GoogleAdsClient client = new GoogleAdsClient(config); GoogleAdsServiceClient googleAdsService = client.GetService(Google.Ads.GoogleAds.Services.V10.GoogleAdsService); googleAdsService.SearchStream(AdwordsClientId, query,                 delegate (SearchGoogleAdsStreamResponse resp)                 {                     foreach (GoogleAdsRow adsRow in resp.Results)                     {                      }                 }             );

When I try as above, I get the following error

Google.Apis.Auth.OAuth2.Responses.TokenResponseException: Error:"unauthorized_client", Description:"Unauthorized", Uri:""

What paths should i follow? Thank you.

Tag:google-ads-api, oauth-2.0, c#, .net, console-application

Only one comment.

  1. dorian

    unauthorized_client could have a couple of reasons. The most important ones that come to mind:

    Did you make sure that your client ID and client secret match? Have you activated the Google Ads API for the GCP project whose OAuth2 client you are using?
    Reply

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