appsettings.json

{
  "AdWordsApi": {
    "client_id": "CLIENT_ID",
    "project_id": "PROJECT_ID",
    "auth_uri": "https://accounts.google.com/o/oauth2/auth",
    "token_uri": "https://oauth2.googleapis.com/token",
    "auth_provider_x509_cert_url": "\"",
    "https": null,
    "redirect_uris": [ "https://developers.google.com/oauthplayground" ],
    "UserAgent": "AdWordsApiExample",
    "OAuth2RefreshToken": "OAUTH2_REFRESH_TOKEN",
    "OAuth2ClientId": "OAUTH_CLIENT_ID",
    "OAuth2ClientSecret": "OAUTH_CLIENT_SECRET",
    "OAuth2AccessToken": "OAUTH_ACCESS_TOKEN", 
    "DeveloperToken": "DEVELOPER_TOKEN",
    "ClientCustomerId": "XXX-XXX-XXXX", 
    "OAuth2Mode": 0 
  },
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*"
}