Here are the payment states you can see in ReservationManager:
Scheduled - Payment request is scheduled to be sent on a date, but not sent yet
Sent - Payment request email has been sent (7 days prior to due date)
Overdue - Payment due date is past and the payment has not been paid online, marked as paid, or canceled.
Complete (Paid) - Payment has been paid online
Refunded - Payment has been fully or partially refunded
Canceled - Payment was canceled
Failed - Payment was not able to be completed due to wrong credit card number, wrong expiration date, NSF, etc.
Error - Payment is in error state