What happens when a Second/Arbitration Chargeback and Pre-Arbitration are accepted?

In the case of Visa – your merchant account will be debited with the dispute amount if you accept a Pre-Arbitration.

In the case of MasterCard – the merchant account has already been debited at second chargeback stage, so no financial transaction occurs when you accept it. In the case of a MasterCard PreArbitration you receive; you will be liable for the dispute if you accept it.