Hi, I am using omniauth to authenticate my users with Google. When the user 
comes back I store their access_token, refresh_token, and their 
verification code off of the callback parameter.
  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"
                  }

When I then try to make a call to the API using the google-api-ads-ruby gem 
I run into trouble.
    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)

I get an invalid grant error on the adwords.authorize line. 
Here is my adwords_api.yml file with the id,secret, and dev token replaced.

:authentication:
  # Authentication method, for web applications OAuth is recommended.
  :method: OAuth2

  #   https://code.google.com/apis/console#access
  :oauth2_client_id: MY_CLIENT_ID
  :oauth2_client_secret: MY_CLIENT_SECRET
  :oauth2_access_type: 'offline'
  :oauth2_approval_prompt: 'force'
  :scope: 
'userinfo.email,userinfo.profile,analytics.readonly,http://gdata.youtube.com,https://adwords.google.com/api/adwords/'
  :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_gzip: false
:library:
  :log_level: INFO




Does anyone know why this would cause an invalid grant error? I think I 
have everything set up properly.

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