Under the orders tab in finances, you will find different status for the orders. Below is the meaning for the different statuses:
Unpaid/Comitted - The member did not complete the payment before completing the registration so they need to pay
Paid - The member has paid for the registration.
Refunded - The fee paid for the registration has been fully refunded
Partial Refund - The fee paid for the registration has been partially refuned (only one or two order items were refunded).
Cancelled - the unpaid order was cancelled and is not linked to the member anymore.