Hi all, sorry to repost, but I am experiencing a new error using oauth2 
with google-api-ads-ruby gem and I wanted to update my question.

I am using omniauth for oauth2 authentication with Google.
  config.omniauth :google_oauth2, ENV['GOOGLE_CONSUMER_KEY'], 
ENV['GOOGLE_CONSUMER_SECRET'],
                  {
                    :scope => 
"userinfo.email,userinfo.profile,analytics.readonly,http://gdata.youtube.com,https://adwords.google.com/api/adwords/";,
                    :approval_prompt => "force",
                    :access_type => "offline"
                  }

*Great: I am able to authenticate the user, get their access_token, 
refresh_token, and verification_code and store them in my database.*

*Bad: Now I am actually trying to make calls to the AdWords API on their 
behalf and experiencing the following error:*
AdsCommon::Errors::AuthError: Authorization error occured: Authorization 
failed.  Server message:
{
  "error" : "invalid_grant"
}

I know I need to authorize with adwords using the verification code and 
this is where I am getting the error.
Here is the method I am using to call the AdWords API. My code is failing 
on adwords.authorize()
    config_filename = File.join(Rails.root, 'config', 'adwords_api.yml')
    adwords = AdwordsApi::Api.new(config_filename)
    api_version = :v201302
    token = adwords.authorize({:oauth2_verification_code => 
google_authentication.verification_code})
    campaign_srv = adwords.service(:CampaignService, api_version)

Here is my adwords_api.yml file:
---
:authentication:
  # Authentication method, for web applications OAuth is recommended.
  :method: OAuth2

  # Auth parameters for OAuth2.0 method.
  :oauth2_client_id: MY CLIENT_ID
  :oauth2_client_secret: MY CLIENT SECRET
  :oauth2_access_type: 'offline'
  :oauth2_approval_prompt: 'force'
  # Callback is set up by the application at runtime.
  :oauth2_callback: 
'http://127.0.0.1:3000/users/auth/google_oauth2/callback'

  # Other parameters.
  :developer_token: MY_DEVELOPER_TOKEN
  :user_agent: MARKETSTARTER
:service:
  :environment: PRODUCTION
:connection:
  # Enable to request all responses to be compressed.
  :enable_gzip: false
:library:
  :log_level: INFO



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