1. Go to Payments > Payment Processing > Payment File Administration.
2. Click Edit next to payment the file that was stuck to Processing Notifications.
3. Change the File Processed? from Processing Notifications to Processed.
4. Click Save.
5. After doing this, you will note that the Email Payment Notification button is now available.
6. Click Email Payment Notification.
7. Select the transactions.
8. Click Submit.
Note: In this situation, bill payments were already processed and user only needs to send the email payment notifications to vendors.