Once you have closed the day you can refund transactions with Edynamo.  Follow these steps to do so.
1. Log into operations.
2. Go to refunds.
3. Search the date or check number the transaction is on.
4. Select the transaction and refund with or without a receipt.
5. Give a reason.
6. Select the Edynamo credit card payment.
7. Insert the credit card if prompted to.