CampSite has several options to 'correct' a payment, depending on the situation and the desired outcome.
Refunding a payment returns the amount of the payment back to the customer. This is typically used when the customer has overpaid, or has cancelled their enrollment.
Reversing a payment does not return money back to the customer - it should be used when the original payment was not valid. A common scenario is a check payment that 'bounced' or was returned for insufficient funds. Financial reporting will show both the original payment and the reversal.
Deleting a payment completely removes the payment from CampSite. This should only be used in exceptional circumstances, as it removes the payment from all financial reporting. Reversing the payment is typically a better option as it retains the record of the original payment in CampSite.