fix: fix customer cancelled typo

[jakubjasinsky]

Summary

In Dynamic Checkout, cancelling a payment on a gateway's hosted page (e.g. KCP) fired processout_dynamic_checkout_payment_error instead of processout_dynamic_checkout_payment_cancelled. Reported by Caterpillar via KCP.

Changes

• Add isCustomerCancellationError helper that matches both customer.canceled (SDK-internal: overlay cancel, tab closed) and customer.cancelled (API error code returned when the customer cancels on the gateway's page)
• Use it at all 6 cancellation checks in DC payment methods (apm, saved-apm, saved-card, card), which previously only matched the SDK-internal spelling
• Add unit tests for the helper + a generic namespace-file loader in the test harness
• Bump version to 1.9.11

Additional Context

• Root cause: tessel9 normalizes gateway-page cancels to customer.cancelled (two "l"s), which reaches the SDK via the checkout page's error action and failed the strict customer.canceled check
• Not KCP-specific — Klarna, RevolutPay, Xendit and others map to the same code
• actionhandler.ts is intentionally untouched so legacy (non-DC) integrations keep receiving the raw error code
• tab_closed stays correct: backend-originated cancels carry no tab_closed metadata, so it reports false

[Copilot]

Pull request overview

Fixes Dynamic Checkout cancellation detection so that cancellations occurring on gateway-hosted pages (which can surface as customer.cancelled) correctly trigger processout_dynamic_checkout_payment_cancelled instead of processout_dynamic_checkout_payment_error.

Changes:

• Introduces isCustomerCancellationError to treat both customer.canceled and customer.cancelled as customer cancellations.
• Replaces all six Dynamic Checkout payment-method cancellation checks to use the new helper.
• Adds unit tests (plus a small test harness helper) and bumps version to 1.9.11.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/support/loadNamespace.ts	Adds loadNamespaceFile helper to execute a single namespace-style source file in tests and return the ProcessOut namespace.
test/dynamic-checkout/errors.test.ts	Adds unit tests validating isCustomerCancellationError behavior for both spellings and non-cancellation codes.
src/dynamic-checkout/utils/errors.ts	Adds isCustomerCancellationError helper to unify cancellation detection across SDK-internal and API-reported codes.
src/dynamic-checkout/references.ts	Includes the new utils/errors.ts file in the Dynamic Checkout outFile reference list.
src/dynamic-checkout/payment-methods/saved-card.ts	Switches cancellation check to isCustomerCancellationError.
src/dynamic-checkout/payment-methods/saved-apm.ts	Switches both cancellation checks to isCustomerCancellationError.
src/dynamic-checkout/payment-methods/card.ts	Switches cancellation check to isCustomerCancellationError.
src/dynamic-checkout/payment-methods/apm.ts	Switches both cancellation checks to isCustomerCancellationError.
package.json	Bumps package version from 1.9.10 to 1.9.11.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.