oauth.rb

require 'oauth'

module Intuit
  module API
    # This returns a Ruby OAuth consumer object initialized with the correct Intuit endpoints
    def self.get_consumer(key, secret)
      @consumer = OAuth::Consumer.new(key, secret, {
        :site                 => "https://oauth.intuit.com",
        :request_token_path   => "/oauth/v1/get_request_token",
        :authorize_path       => "/oauth/v1/get_access_token",
        :access_token_path    => "/oauth/v1/get_access_token"
      })
    end

    # This returns the URL the application needs to redirect to for authorization, given a request token
    def self.authorize_url(token, returl = "")
      return "https://appcenter.intuit.com/Connect/Begin?oauth_token=#{token}"
    end
  end
end

consumer = Intuit::API.get_consumer("intuit_consumer_key", "intuit_consumer_secret")
token = consumer.get_request_token(:oauth_callback => "http://foo.bar/com/")
puts token.inspect

output.txt

% ruby token.rb
/usr/local/rvm/gems/ruby-1.9.3-p194-perf@rails3/gems/oauth-0.4.7/lib/oauth/consumer.rb:178:in `request': consumer_key_unknown (OAuth::Problem)
from /usr/local/rvm/gems/ruby-1.9.3-p194-perf@rails3/gems/oauth-0.4.7/lib/oauth/consumer.rb:194:in `token_request'
from /usr/local/rvm/gems/ruby-1.9.3-p194-perf@rails3/gems/oauth-0.4.7/lib/oauth/consumer.rb:136:in `get_request_token'
from token.rb:23:in `<main>'