title: Is a payments callback URL required with Facebook local currency flow?
body: <p>While implementing and testing local currency payment flow for my app I got an error with the pay dialog.</p>
  
  <pre><code>error_code = 1383044
  error_message = "no callback url"
  </code></pre>
  
  <p>I have been reading the How-To at <a href="https://developers.facebook.com/docs/howtos/payments/" rel="nofollow">https://developers.facebook.com/docs/howtos/payments/</a> and the impression I got was that the payments callback was optional.  However this error message seems to imply that it is required.  Is setting up a payments callback a must for local currency payments?</p>
  
  <p>(also, as a side question, are real time updates different from the payments callback? <a href="https://developers.facebook.com/docs/howtos/payments/fulfillment/#rtu" rel="nofollow">https://developers.facebook.com/docs/howtos/payments/fulfillment/#rtu</a>)</p>