title: Facebook requests - how to pass through custom variables from the Requests page
body: <p>I am building a facebook app that has a send to friend feature in it.</p>
  
  <p>Each user is given a specific userkey that identifies them and them alone.</p>
  
  <p>So Person A invites person B.</p>
  
  <p>So when person B gets the invite, when they click ACCEPT, we pass the referrer userkey in the URL… 
  e.g.  <a href="http://mydomain.com.au/return_user.aspx?referrerkey=iuahsduiahsdfuiha" rel="noreferrer">http://mydomain.com.au/return_user.aspx?referrerkey=iuahsduiahsdfuiha</a> </p>
  
  <p>So when person B has already installed the fb app, the referrerkey variables is passed back to our site, so we can manage the link between the 2 users there.</p>
  
  <p>However if person B hasn’t added the app. And Person B clicks the ACCEPT button on the invites page the user has to be take through the “Allow Access” page, from there, they are directed back to the APP home page, with none of the variables I need. E.g. the referrerkey.</p>
  
  <p>So how can i get this to work for both users that have already added the app and havent added the app?</p>