How can this happen?

This error could occur due to API outage of your Accounting Package. You can view the API status from this links:

Xero - 

QBO - 


      1. Click "Fix" from the Unprocessed Payments warning
      2. Find the Transaction
      3. Select "Retry"


If you accidentally clicked "Fixed Manually" instead of "Retry", you can take a manual payment to the Wise-Pay clearing account in Xero/QBO. If you take a manual payment, it is the same action that would have happened in your Accounting Package that would cause you to mark it "Fixed Manually".