This is a fee that is accessed by the card issuing bank that gets passed onto the payment processor and the merchant. It is standard in the credit card processing industry and unfortunately is unavoidable when a chargeback is filed and lost.
Whenever we receive notification that a chargeback is initiated, we send notification emails to the donor, fundraiser and the charity in an effort to get the donor to cancel the chargeback. This is the only way to avoid this fee. Whenever you receive a notification email about a chargeback, it is best practice for the nonprofit to reach out to the donor directly to get them to drop the dispute