The refund API allows you to manipulate refunds that have been created on a payment. Funds will be refunded to either the card or wallet that was originally charged or to a bank account if a direct refund is not possible
Cancelling a refund will mark it as CANCELLED.
This scenario you will probably use the most
err := client.Merchant("merchantId").Refunds().Cancel("refundId", nil)
Please find below an overview of the possible responses.
Response 204 - No content
For every successfully approved refund resource a HTTP 204 response is returned.