We have a standard process for requesting refunds to be created if it was paid through B2B Payments.
Click on the ‘Payments’ tab on your main navigation bar. You will land on the Dashboard page. Search for the sales order/invoice you want to create a refund for, and click on the Refund button on the right-hand side.
Do note that only primary account holders will be able to create/request a refund. For more information on our refund process, read this.