In order to correctly use the refund system from Shopify, you need to know what the settlement period of your transactions are. This settlement period is dependent on you acquirer. Reach out to your Verifone representative for more information.
Locate the transaction you want to refund and click on Refund.
Enter a refund reason (optional) and the refund amount.
If you are issuing a partial refund, note that this type of refund can only be done after the transaction has been settled.
If you initiate this refund from Shopify before settlement, you may need to reinitiate the refund from your Verifone Central account at a later date.