title: PHP openID integration in Magento
body: <p>Can anybody tell me how multiple-openid authentication works here in Stack Overflow? I have this doubt since I want to implement the same functionality in my new magento site. The only doubt I have is, if I login using openID I will be using my unique url (eg:http://example.myopenid.com).  Now, when I want to shop something, I must receive an email of confirmation, how do I receive that without entering it anywhere?</p>
  
  <p>A similar scenario is in the current site, ie. stackoverflow.com. I am posting this question using my openid authentication. Now, how would I know if someone posts answers to my question, or if some one comments on it? Please help me know this.</p>