Card Present Refund
A card present refund is the return of money onto a card that is not associated with a purchase or or preauthorized transaction. Because this refund isn't tied to a specific transaction, there's no limit on the amount that you can refund.
If you want to issue a card-on-file refund that is linked to a specific transaction, you can learn about it HERE.
Request Structure
Response Structure
Errors
If your response contains errors, visit the Errors page for a detailed description of each one.