To issue refund from your EventsAir Pay (after you have canceled or otherwise recorded this on the attendee record):
Log into your AirWallex Account - you'll see the EventsAir Pay (powered by AirWallex) Dashboard.
Click on "Payments" (left-hand menu).
Click on "Payment activity" (second tab) to see a list of payments you've received.
Click on the item to be refunded.
Select the "Refund" button (top right).
You'll see a pop-up: enter the amount and reason for refund.
Click the purple Refund button to return this amount to the attendee.
For more information on refunds, read this article.