Is your receipt stuck? Not being processed? Here's how to send it back to your queue to be processed (within your plan limits).
Go to the 'Awaiting Processing' queue.
You will find any pending entries with the 'Untitled document' name.
Click on the document, the click the 'change type' button in orange. (If you can't see this button, and see "Processing..." instead, it means the document is already in the processing queue.)
Then click on the 'Process automatically' button to send it back to the queue.
You should now see the 'Processing...' status. The document will be processed shortly.