Yes, a Flex customer can create a transfer refund via the Flex APIs and via the Dashboard.
To create a refund via the API, use this API call: Refund a debit.
To create a refund via the Dashboard:
1. Navigate to the TRANSACTIONS header. Click on Transfers.
2. Search for the Debit transaction you would like to create a refund for.
3. On the transfers information page, click on the Create Refund button. A pop-up modal appears. Enter in the refund amount and click the Create button. A success message will appear that confirms you refund request.