> For the complete documentation index, see [llms.txt](https://developer.paywall.one/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.paywall.one/payment-orchestration-integration-document/payment-service/18.-batch-processing-method/2.-cancellation.md).

# 2. Cancellation

**Batch:** You can send a batch payment order, along with its MerchantUniqueCode, to the Paywall APIs to cancel the entire batch payment and all its associated transactions.

**List:** You can provide Paywall's batch cancellation service with a list of payments identified by your MerchantUniqueCode values (which may be from batch or single transactions). This allows you to complete the cancellation of all listed transactions with a single API call and receive a single callback notification from Paywall in response.