> For the complete documentation index, see [llms.txt](https://docs.umbcheckout.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.umbcheckout.net/v17/core-services/cancellation-tokens.md).

# Cancellation Tokens

Passing a CancellationToken to UmbCheckout's services

Every public async service method in UmbCheckout 17 can take a `CancellationToken`. Pass the request's token (`HttpContext.RequestAborted`, or the `cancellationToken` your notification handler receives), so work stops when the shopper leaves.

* New methods take it as an optional last parameter (`CancellationToken cancellationToken = default`).
* Methods that existed in v13 keep their old signature, and gain an overload with a `CancellationToken` as the last parameter. These overloads are default interface methods that call the old method, so classes that implement the interfaces still compile. The old overloads are `[Obsolete]` and will be removed in the next major version: call the overload with the token (see [Upgrading from v13](/v17/getting-started/upgrading-from-v13.md#breaking-changes)).
* UmbCheckout's own controllers, view components, Forms workflow and notification handlers pass the request's token.
* When a shopper leaves during checkout, the call to Stripe stops, and the request ends quietly (no error page, no error log). A Stripe timeout is logged as a warning.
* A refund's call to Stripe is never cancelled, so it always reaches the audit log.

The services with token overloads are: the session, basket, currency and basket context services; the Stripe session, client factory, line and basket pricing, shipping options and shipping rate services; and, in the add-ons, the cookie service and the Stripe payments, invoices, refunds, customers and tax rate services.

### Mocks and decorators

Because UmbCheckout calls the token overloads:

* a Moq mock set up only for the old overload returns `null` from the new one. Set up the overload with the `CancellationToken`;
* a decorator that overrides only the old method is bypassed. Override the token overload too.

For example, mock `CreateSessionAsync(basket, It.IsAny<CancellationToken>())` rather than `CreateSessionAsync(basket)`.


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