Payment processors have refund limitations based on date of purchase. Most processors limitations are approximately 120 days from date of purchase. You are still able to manually edit/refund the transaction details in TRYTN, but refunds to customer will have to be made separately.

Transactions >  In the “Search” box search transactions by typing in buyer name, Transaction Id or email address > Actions > Details to expand specific transaction information.

The option for refund to be settled outside of the payment processor for the specific transaction will be greyed out. 

Click "Refund" or "Edit Transaction" as needed and go through steps to notate the transaction as refunded or partially refunded.