Description of Reason Code C02
Credit Not Processed
Insights from Rules and Regulations
American Express has not received the credit (or partial credit) the merchant was to apply to the card.
How to Win Reason Code C02
If no credit (or only partial credit) is due, provide a written explanation of why credit is not due with appropriate documents to support your position, or proof that a credit which directly offsets the disputed charge has already been processed.
Transaction Modifiers applicable to Reason Code C02