title: mobile paypal return without $_POST variables
body: <p>On my application I am using the post variables from a completed transactions (e.g. transaction reference and amount) on return from the checkout and payment completion on Paypal. </p>
  
  <p>The ones I am using are:</p>
  
  <pre><code>$_POST['custom']
  $_POST['txn_id']
  $_POST['mc_gross']
  </code></pre>
  
  <p>This works fine on the normal site, however when testing on my mobile no $_POST variables are returned to the complete page.</p>
  
  <p>I do have an IPN set up so could do verification from that way - it just seems very odd that via the normal site this works fine and via the mobile site is doesn't appear to have the same functionality?</p>