A Refund can be issued at any time, and per the donor's request to the organization.  This can occur if a donor accidentally submitted a donation more than once, or if they accidentally entered a greater amount than what was intended. 

Note:  Refunds must be issued within 180 days from the date of the original transaction after November 9th, 2014. Transactions processed prior to this date must be refunded within 60 days

A Chargeback is issued when a donor disputes the donation/transaction with their credit card company.  This can occur if the card was reported stolen or the cardholder does not recall making the specified transaction.  Credit card processing companies charge approximately $15 per chargeback issued.  To dispute a Chargeback, or if you have questions about what criteria is necessary in order for a Chargeback to be disputed, email ChargeBacks@Blackbaud.com.