title: The "paypal for digital goods plugin" for wordpress redirects to blank confirmation page
body: <p>I have set up a sandbox account and have selected option 2 to get my api credentials giving me my merchants user name, password and signature. I have uploaded my wordpress site to a sub domain of the email address I used to registered with Paypal. I have installed the plugin...</p>
  
  <p><a href="https://wordpress.org/plugins/paypal-for-digital-goods/" rel="nofollow">https://wordpress.org/plugins/paypal-for-digital-goods/</a></p>
  
  <p>activated it and entered the details found on the option 2 page as well as setting the check box to work with the sandbox account. I then added a purchase button to one of the pages on the website.</p>
  
  <p>When I click the purchase button it allows me to login and shows me the correct payment, allows me to accept the payment and then sends me back to the plugin page...</p>
  
  <p><a href="http://xxxxxxxx.xxxxxxxxxxxx.com/?page_id=2593?step=confirm&amp;token=EC-1K141602YT0994237&amp;PayerID=62CA9BAZ6BYN4" rel="nofollow">http://xxxxxxxx.xxxxxxxxxxxx.com/?page_id=2593?step=confirm&amp;token=EC-1K141602YT0994237&amp;PayerID=62CA9BAZ6BYN4</a></p>
  
  <p>BUT this page is blank with no information even after viewing source code and no download has been offered.</p>
  
  <p>I'm a bit stuck as I have read quite a few instructions on how this should be done and I seem to have followed all the required steps. So any help would be appreciated.</p>