I am unable to refund a duplicate transaction in Luminate Online. How do I refund in PayPal Payflow.
To process a credit/refund in PayPal Payflow Pro:
Login to PayPal Manager. Select Virtual Terminal. Select Single Transaction. Choose Transaction Type "Credit" Enter the processor id as the original transaction id. This can be found by running a report in Report Writer, or searching reports in PayPal. Select Submit.