title: jms payment corebundle integtation issue URL return
body: <p>I'm integration the jms payment bundle in symfony 2.6.
  I had followed all document in : <a href="http://jmspaymentcorebundle.readthedocs.io/en/stable/guides/accepting_payments.html" rel="nofollow noreferrer">http://jmspaymentcorebundle.readthedocs.io/en/stable/guides/accepting_payments.html</a></p>
  
  <p>I'm getting this error : </p>
  
  <pre><code> You must configure a return url.
  </code></pre>
  
  <p>I had configured the return URL into ON in my account , and it seems not working, getting the same error. 
  My confirmation url is a page in which there is some text like : </p>
  
  <pre><code>  Thank you for your payment. Your transaction has been completed,
    and a receipt for your purchase has been emailed to you.
    You may log into your account at www.paypal.com to view details of this transaction.
  </code></pre>
  
  <p>The error persists. 
  What should i do ?</p>