Call the eBay API from Rails using HTTParty. Works in Rails 3, since it's calling the API directly.

ebay.yml

development:
  dev_id: 00000000000000000
  app_id: 00000000000000000
  cert_id: 0000000000000000
  uri: https://api.sandbox.ebay.com/ws/api.dll
  auth_token: 00000000000000

eBay_GeteBayOfficialTime.rb

require 'rubygems'
require 'httparty'

EBAY_CONFIG = YAML::load(File.open("config/ebay.yml"))['development']

class Ebay
  include HTTParty
 
  def self.getEbayOfficialTime
    format :xml
    
    headers(ebay_headers.merge({"X-EBAY-API-CALL-NAME" => "GeteBayOfficialTime"}))

    requestXml = "<?xml version='1.0' encoding='utf-8'?>
                  <GeteBayOfficialTimeRequest xmlns=\"urn:ebay:apis:eBLBaseComponents\">
                    <RequesterCredentials>
                      <eBayAuthToken>#{auth_token}</eBayAuthToken>
                    </RequesterCredentials>
                  </GeteBayOfficialTimeRequest>"

    response = post(api_url, :body => requestXml)
    raise "Bad Response | #{response.inspect}" if response.parsed_response['GeteBayOfficialTimeResponse']['Ack'] != 'Success'
    response.parsed_response['GeteBayOfficialTimeResponse']['Timestamp']  
  end

  private
  
  def self.ebay_headers
    {"X-EBAY-API-COMPATIBILITY-LEVEL" => "433",
               "X-EBAY-API-DEV-NAME" => EBAY_CONFIG['dev_id'],
               "X-EBAY-API-APP-NAME" => EBAY_CONFIG['app_id'],
               "X-EBAY-API-CERT-NAME" => EBAY_CONFIG['cert_id'],
               "X-EBAY-API-SITEID" => "0",
               "Content-Type" => "text/xml"}
  end

  def self.auth_token
    EBAY_CONFIG['auth_token']
  end

  def self.api_url
    EBAY_CONFIG['uri']
  end
end

puts Ebay.getEbayOfficialTime