Payments:
Stripe
To refund a payment using the Dashboard:
Go to Payments menu.
Find the payment you want to refund in the Payments page.
Click the overflow menu () to the right of the payment, then select Refund payment.
By default, you’ll issue a full refund. For a partial refund, enter a different refund amount.
Select a reason for the refund. If you select Other, you must add a note that explains the reason for the refund. Click Refund.
SimplePay
To cancel a transaction and process a refund, please follow the steps below:
Log in to the Back Office interface designed for service providers.
In the left-side menu, click on the "Transaction List" menu item and locate the relevant transaction.
Click on the transaction ID to view the detailed information.
In the top menu bar, click on "Refund" to initiate the cancellation of the transaction.
Select the refund method — you can choose to refund either the full amount or a partial amount.
Approve the request by clicking the "OK" button.
Please note that in the case of a transaction made by bank card — regardless of the settlement status — you must always proceed according to the steps detailed above.
Invoicing:
Számlázz.hu
Fot the latest guide, visit this link(only Hungarian version available): https://tudastar.szamlazz.hu/gyik/szamla-sztornozasa
Billingo
Fot the latest guide, visit this link(only Hungarian version available):