---
title: "Cancel or refund a transaction"
url: "https://docs.adyen.com/point-of-sale/classic-library-deprecation/classic-library-integrations/c-library-integration/key-steps-c-library/cancel-or-refund-a-transaction-c-library"
source_url: "https://docs.adyen.com/point-of-sale/classic-library-deprecation/classic-library-integrations/c-library-integration/key-steps-c-library/cancel-or-refund-a-transaction-c-library.md"
canonical: "https://docs.adyen.com/point-of-sale/classic-library-deprecation/classic-library-integrations/c-library-integration/key-steps-c-library/cancel-or-refund-a-transaction-c-library"
last_modified: "2026-05-23T12:56:20+02:00"
language: "en"
---

# Cancel or refund a transaction

[View source](/point-of-sale/classic-library-deprecation/classic-library-integrations/c-library-integration/key-steps-c-library/cancel-or-refund-a-transaction-c-library.md)

There are a number of ways to cancel or refund a transaction, depending on its state:

* [Refund a balance to a card](/point-of-sale/classic-library-deprecation/classic-library-integrations/c-library-integration/extras-c-library/start-gift-card-transactions-c-library/refund-a-balance-to-a-gift-card-c-library) - Use this to perform a refund on the terminal. This is an unreferenced refund. 
* [Cancel an ongoing transaction](/point-of-sale/classic-library-deprecation/classic-library-integrations/c-library-integration/key-steps-c-library/cancel-or-refund-a-transaction-c-library/cancel-a-transaction-c) - Use this to cancel a transaction that is currently being processed on your payment terminal.
* [Cancel or Refund a completed transaction from the terminal transaction list](/point-of-sale/classic-library-deprecation/classic-library-integrations/c-library-integration/key-steps-c-library/cancel-or-refund-a-transaction-c-library/refund-a-transaction-from-the-ped-c) - Use this to cancel or refund a transaction from the terminal transaction list, and receive a receipt on the POS or on the PED.
* [Cancel or Refund a transaction directly from a POS to the Adyen Payments Platform](/point-of-sale/classic-library-deprecation/classic-library-integrations/c-library-integration/key-steps-c-library/cancel-or-refund-a-transaction-c-library/refund-a-transaction-from-the-pos-c) - Use this to cancel a transaction that has already processed from your POS to the Adyen payments platform.
* [Partially refund a balance](/point-of-sale/classic-library-deprecation/classic-library-integrations/c-library-integration/key-steps-c-library/cancel-or-refund-a-transaction-c-library/partially-refund-a-balance-c-library) - Use this to refund a partial amount to a card. This is a referenced partial refund.